DE1504104B2 - Verfahren und vorrichtung zur herstellung von kontaktlinsen - Google Patents
Verfahren und vorrichtung zur herstellung von kontaktlinsenInfo
- Publication number
- DE1504104B2 DE1504104B2 DE1964C0033755 DEC0033755A DE1504104B2 DE 1504104 B2 DE1504104 B2 DE 1504104B2 DE 1964C0033755 DE1964C0033755 DE 1964C0033755 DE C0033755 A DEC0033755 A DE C0033755A DE 1504104 B2 DE1504104 B2 DE 1504104B2
- Authority
- DE
- Germany
- Prior art keywords
- shape
- edge
- polymerization
- area
- sharp edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007334 copolymerization reaction Methods 0.000 claims description 5
- 239000000499 gel Substances 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000009736 wetting Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 2
- 239000000017 hydrogel Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 210000004087 cornea Anatomy 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 210000000744 eyelid Anatomy 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 229940015043 glyoxal Drugs 0.000 description 1
- 150000001261 hydroxy acids Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- -1 lactic Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
- B29C41/045—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry the axis being placed vertically, e.g. spin casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/38—Moulds, cores or other substrates
- B29C41/383—Moulds, cores or other substrates with means for cutting the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00038—Production of contact lenses
- B29D11/00057—Production of contact lenses characterised by the shape or surface condition of the edge, e.g. flashless, burrless, smooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00038—Production of contact lenses
- B29D11/00115—Production of contact lenses made by rotational casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00471—Production of simple or compound lenses made by rotational casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/0041—Contact lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/76—Office equipment or accessories
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/808—Lens mold
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Eyeglasses (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Kontaktlinsen aus vernetzten, hydrophilen
Gelen durch Copolymerisation von Lösungen ungesättigter Monomerer, bei.dem die Copolymerisation
bis zum Gelieren des Polymerisatiönsänsatzes unter Schutzgas in einer rotierenden Form durchgeführt
und die nach vollendeter.Polymerisation.entstandene Linse so lange in Wasser gequollen wird, bis sie
leicht aus der Form entnehmbar ist, nach Hauptpatent 1504 082.
Bei dem Verfahren nach dem Hauptpatent ist nachteilig, daß der obere Rand des Polymerisationsänsatzes,
welcher die Grenzlinie zwischen Flüssigkeit und Form bildet, nicht genau in der gleichen Höhe
der Form verläuft. Ursächlich für diese Erscheinung sind das schwer koppelbare Zusammenwirken zahlreicher Einflußgrößen... wie Bodenforms-Drehzahl,
Neigung der Drehachse, Dichte der polymerisierenden Flüssigkeit, Benetzungswinkel usw. Insbesondere
bei einer wirtschaftlich erwünschten schnellen Polymerisation stellt sich der Benetzungswinkel an der
genannten Grenzlinie in der Regel langsamer ein als der Polymerisationsprozeß abläuft, so daß in der zu
bildenden Linse ein in ihrer endgültigen Form festgehaltener Unwuchtszustand zum Ausdruck kommt, der
von den Bereichen der Benetzung der Form beim Einbringen der dosierten Menge abhängt.
Es kann zum Beispiel vorkommen, daß beim Dosieren und Rühren der Mischung in der Form das
Gemisch über die Grenzlinie, die bei gegebener Gestalt der Form und vorgegebener Rotationsgeschwin-•-digkeit
der ,Gleichgewichtslinie entspricht, hinausgetragen
wird. Dann fließt jedoch der Flüssigkeitsfilm, der über dieser Grenzlinie anhaftet, nicht rasch genug
herab und bleibt an der Kontaktlinse gewöhnlich in unregelmäßiger Breite erhalten. Beim Gebrauch
einer solchen Linse kann dabei die Hornhaut gereizt werden. Außerdem legt sich der Rand, da er in der
Regel sehr dünn ist, leicht um oder reißt ab, wodurch an der angerissenen Stelle der Riß infolge der geringen
strukturellen Festigkeit der Gelmasse in die Linse fortschreiten kann.
' - Eine Unregelmäßigkeit in der Ausbildung des
Randes bei rasch verlaufender Polymerisation kann sich außerdem dadurch einstellen, daß bei der Rotation
die Grenzlinie der Flüssigkeit mit ungleichmäßiger Geschwindigkeit bis zur Erreichung der Gleichgewichtslinie
an der Form entlang ansteigt.
Der Erfindung liegt die Aufgabe zugrunde, bei Durchführung des Verfahrens nach dem Hauptpatent
eine genaue Grenzlinie des Polymerisationsansatzes in der Form zu erreichen. Zur Lösung dieser Aufgabe
wird erfindungsgemäß die durch den Polymerisationsansatz in der Form benetzte Fläche durch eine
scharfe Kante der Form begrenzt, die im Bereich des gewünschten Linsenrandes liegt.
Die Erfindung schafft also eine Möglichkeit, beim .Polymerisationsguß in rotierenden Formen auch mit
rasch ablaufender Polymerisation arbeiten zu können. Die im Bereich des gewünschten Linsenrandes
vorgesehene scharfe Kante der Form ist für die Flüssigkeit ein so wirksames Hindernis, daß es praktisch
zu keinem Überschreiten dieser Kante kommt.
Es ist zweckmäßig, nach dem Füllen der Form mit dem dosierten Momomergemisch die Drehzahl der
Form so zu erhöhen, daß die Flüssigkeit schnell die scharfe Kante erreicht, worauf die Drehzahl auf den
Wert gesenkt wird, der zur Ausbildung der gewünschten optischen Fläche erförderlich ist.
Bei Verwendung einer rotierenden Form, die mit einem glatten kugel- oder paraboloidförmigen Boden
versehen ist, ist es nach .einem weiteren Vorschlag der Erfindung vorteilhaft, daß die Form im Bereich
des gewünschten Linsenrandes eine scharfe Kante aufweist, die die rotationssymmetrische Fläche der (
Form in eine'r zur Symmetrieachse der Form geneigten
Ebene begrenzt.
Die Kante kann jedoch auch derart erzeugt werden, daß sie der Schnittlinie zwischen der konkaven
Inhenoberfläche und einer Zur Symmetrieachse geneigten Ebene entspricht. Es entsteht dann eine ganz
genau begrenzte unsymmetrische Kontaktlinse, die sich beim Auflegen auf das Auge auf Grund ihrer
Unsymmetrie bezüglich des Auges infolge des un-
-r symmetrischen Druckes vom Augenlid her von selbst
eine bestimmte, passende Lage aufsucht. :
Die Verwendung einer unsymmetrischen Linse der vorstehend geschilderten Art kann beispielsweise
dann zweckmäßig sein, wenn es sich um eine Linse mit zylindrischer Refraktion handelt, die bei einem
astigmatischen Auge in einer bestimmten Lage gehalten werden muß und nicht rotieren darf. '■■
Ganz allgemein ist es möglich, die Kante in beliebigem Lauf zu führen und überdies Formen zu verwenden,
die nicht rotationssymmetrisch sind. '
Die Herstellung und Ausbildung der Begrenzungs- \ kanten wird an Hand von drei in einer Zeichnung
dargestellten Ausführungsbeispielen näher erläutert. Mit 1 ist dabei die konkave Form bezeichnet. Mit \
3 4
2 ist die begrenzende Kante gekennzeichnet. 3 zeigt siert werden, welche nach beendeter Polyreaktion im
die sich bildende Linse. 4 deutet den Kitt an und 5 gequollenen Zustand klare, weiche und elastische
den Mantel der Form. Hydrogele bilden. Geeignete Ausgangsstoffe sind
Im ersten Fall (oben) ist in die Metallform 1 aus zum Beispiel Ester von Glykolen mit Acrylsäure,
Chemisch widerstandsfähigem, inertem Metall eine 5 Methacrylsäure oder anderen, auch mehrbasichen
ringförmige Rille mit der Kante 2 eingeschnitten. ungesättigten Säuren, die zur Polymerisation bzw.
Im zweiten Fall (Mitte) besteht die Form aus Glas, Kopolymerisation fähig sind. So kommen etwa
und die Kante ist durch Einpressen einer erhitzten noch die Itakonsäure, die Fumarsäure und andere
Metallpatrize gebildet. Gegebenenfalls kann Vaku- in Frage, wobei die Hauptkomponente der Mono-
umverformung angewandt werden. io ester und das Vernetzungsmittel der zugehörige
Im dritten Fall (unten) ist die ganze Form in den Diester ist. Man kann auch ionogene Gele unter
Mantel 5 derart eingepreßt und eingekittet, daß sich der Voraussetzung verwenden, daß deren saure oder
die Kante 2 ausbildet. basische Gruppen neutralisiert werden. So kann zum
Statt eine Form in einen Mantel einzubringen und Beispiel auch das Gemisch der Monomere verhältnis-
auf die geschilderten Arten die Begrenzungskante 15 mäßig große Anteile an Methacrylsäure enthalten,
auszubilden, kann natürlich auch die ganze Einheit jedoch muß dann das fertige Kopolymer neutralisiert
aus einem einzigen Stück nichtrostenden Stahls ge- werden, z. B. durch längeres Einlegen in eine Lösung
dreht werden. von Natriumbikarbonat. Ein anderes geeignetes Ma-
Die Formen können aus Glas, geschmolzenem terial ist etwa Polyvinylalkohol, der mit Glyoxal bei
Quarz, stark vernetzten plastischen Massen, be- 20 einer Temperatur von 70 bis 90° C vernetzt wurde,
stimmten Metallen wie Titan und dessen Legierun- In gleicher Weise können auch die Ester der oben
gen, gegebenenfalls galvanisch oder sonstwie mit angeführten polymerisationsfähigen Säuren mit hy-
einem Überzug aus Chrom oder einem anderen ge- drophilen Polyolen, wie Glycerin, Pentaerythritol
eigneten Material versehen, hergestellt werden. oder Mennitol oder Estern von ungesättigten Hy-
Das Hydrogel kann aus irgendeinem Gemisch von as droxysäuren (wie Milch-, Äpfel-, Wein- und Zitro-
hydrophilen Monomeren oder einem Gemisch hydro- nensäure) mit ungesättigten Alkoholen, wie zum Bei-
philer Polymerer mit Vernetzungsmitteln syntheti- spiel Allylalkohol, verwendet werden.
Hierzu 1 Blatt Zeichnungen
Claims (3)
1. Verfahren zur. Herstellung von Kontaktlinsen
aus vernetzten, Tiydrophilen Gelen durch Copolymerisation
von Lösungen ungesättigter Monomerer bei dem die Copolymerisation bis zum Gelieren des Polymerisationsansatzes unter
Schutzgas in einer rotierenden Form durchgeführt und die nach vollendeter Polymerisation
entstandene Linse so lange in Wasser gequollen wird, bis sie leicht jius der Form entriehmbar ist,
nach Patent 1504Φ82, dadurch ■gekennzeichnet-, daßidie durch den Polymerisationsansatz in der Form' benetzte Fläche durch" eine
scharfe Kante der'Form begrenzt wird, die im
Bereich des gewünschten Linsenrandes liegt.
2. Verfahren nach Anspruch !,dadurch gekennzeichnet,
daß nach dem Füllen der Forni mit dem dosierten Momomergemisch die Drehzahl
der Form so erhöht wird, daß die Flüssigkeit schnell die scharfe Kante erreicht, worauf die
Drehzahl auf den Wert gesenkt wird, der zur Ausbildung der gewünschten optischen Fläche
erforderlich ist.
3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2, mit einer rotierenden
Form, die mit einem glatten kugel- oder paraboloidförmigen
Boden versehen ist, dadurch gekennzeichnet, daß die Form (1) im Bereich des gewünschten Linsenrandes eine scharfe Kante (2)
apfweist, die die rotationssymmetrische Fläche der Form in einer zur Symmetrieachse der Form
geneigten Ebene begrenzt;
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS504163 | 1963-09-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE1504104A1 DE1504104A1 (de) | 1969-02-20 |
DE1504104B2 true DE1504104B2 (de) | 1973-03-08 |
Family
ID=5394488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1964C0033755 Granted DE1504104B2 (de) | 1963-09-11 | 1964-08-28 | Verfahren und vorrichtung zur herstellung von kontaktlinsen |
Country Status (11)
Country | Link |
---|---|
US (1) | US3408429A (de) |
AT (1) | AT284429B (de) |
BE (1) | BE652962A (de) |
CH (1) | CH423214A (de) |
DE (1) | DE1504104B2 (de) |
DK (1) | DK106582C (de) |
ES (1) | ES303931A1 (de) |
GB (1) | GB1078715A (de) |
IT (1) | IT943007B (de) |
NL (1) | NL128305C (de) |
SE (1) | SE303038B (de) |
Families Citing this family (336)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822089A (en) * | 1968-09-25 | 1974-07-02 | Akademie Ved | Contact lens blank or replica made from anhydrous, sparingly cross-linked hydrophilic copolymers |
US4197266A (en) * | 1974-05-06 | 1980-04-08 | Bausch & Lomb Incorporated | Method for forming optical lenses |
US4022855A (en) * | 1975-03-17 | 1977-05-10 | Eastman Kodak Company | Method for making a plastic optical element having a gradient index of refraction |
US4555372A (en) * | 1981-03-23 | 1985-11-26 | Bausch & Lomb Incorporated | Rotational molding of contact lenses |
FI831399L (fi) * | 1982-04-29 | 1983-10-30 | Agripat Sa | Kontaktlins av haerdad polyvinylalkohol |
US4590018A (en) * | 1982-09-13 | 1986-05-20 | Neefe Charles W | Method of improving spin cast lenses |
US4416837A (en) * | 1982-09-13 | 1983-11-22 | Neefe Charles W | Spin casting of contact lenses |
US4468184A (en) * | 1983-05-02 | 1984-08-28 | International Hydron Corporation | Gas feed means for use in centrifugal casting devices |
CS243055B1 (en) * | 1983-05-23 | 1986-05-15 | Otto Wichterle | Contact lenses production equipment |
AU577315B2 (en) * | 1983-09-27 | 1988-09-22 | Barnes-Hind Inc. | Lens mould and moulding |
CS256889B1 (en) * | 1984-04-20 | 1988-04-15 | Otto Wichterle | Method of contact lenses' centrifugal casting in open moulds and equipment for realization of this method |
US4719248A (en) * | 1985-08-08 | 1988-01-12 | Bausch & Lomb Incorporated | Ultraviolet blocking agents for contact lenses |
CA1295941C (en) | 1985-08-16 | 1992-02-18 | Rajan Bawa | Sustained-release formulation comprising a hydrophobic polymer system |
US4668506A (en) * | 1985-08-16 | 1987-05-26 | Bausch & Lomb Incorporated | Sustained-release formulation containing and amino acid polymer |
US4732715A (en) * | 1985-09-20 | 1988-03-22 | Bausch & Lomb Incorporated | Manufacture of polymeric contact lenses |
US4921884A (en) * | 1987-02-26 | 1990-05-01 | Minnesota Mining And Manufacturing Company | Hydroxy-substituted polymeric shaped hydrogel article |
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SE303038B (de) | 1968-08-12 |
BE652962A (de) | 1964-12-31 |
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DK106582C (da) | 1967-02-20 |
CH423214A (de) | 1966-10-31 |
US3408429A (en) | 1968-10-29 |
GB1078715A (en) | 1967-08-09 |
DE1504104A1 (de) | 1969-02-20 |
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