GB2338922A - Process for preparing silicone rubber pushbuttons - Google Patents
Process for preparing silicone rubber pushbuttons Download PDFInfo
- Publication number
- GB2338922A GB2338922A GB9814493A GB9814493A GB2338922A GB 2338922 A GB2338922 A GB 2338922A GB 9814493 A GB9814493 A GB 9814493A GB 9814493 A GB9814493 A GB 9814493A GB 2338922 A GB2338922 A GB 2338922A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pushbuttons
- silicone rubber
- preparing silicone
- pushbutton
- preparing
- 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.)
- Withdrawn
Links
- 229920002379 silicone rubber Polymers 0.000 title description 23
- 239000004945 silicone rubber Substances 0.000 title description 23
- 238000004519 manufacturing process Methods 0.000 title description 17
- 238000000034 method Methods 0.000 description 10
- 238000007493 shaping process Methods 0.000 description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 7
- 239000004926 polymethyl methacrylate Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000001678 irradiating effect Effects 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 229920001296 polysiloxane Polymers 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- -1 polysiloxane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000011417 postcuring Methods 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 229920006352 transparent thermoplastic Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/002—Materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/016—Protection layer, e.g. for legend, anti-scratch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/02—UV or light sensitive
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/028—Printed information
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2229/00—Manufacturing
- H01H2229/044—Injection moulding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2229/00—Manufacturing
- H01H2229/058—Curing or vulcanising of rubbers
Landscapes
- Manufacture Of Switches (AREA)
- Push-Button Switches (AREA)
- Input From Keyboards Or The Like (AREA)
Description
1 2338922 The Process for Preparing Silicone Rubber Pushbuttons
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a process for preparing silicone rubber pushbuttons.
Description of the prior art
Conventional silicone rubber pushbuttons are composed of both of rubber and plastic materials and therefore, an additional mold for the plastic material is necessary, which adds the process a very high cost Further, conventional processes for preparing silicone rubber pushbuttons are generally both complicate and time consumptive as well as needed a high cost Accordingly, there exists a need for developing a new process for preparing silicone rubber pushbutton to overcome these problems.
SUMMARY OF THE EWENTION
In order to solve the above-said technical problems, one object of the invention is to provide a process for preparing silicone pushbuttons, said process comprises forming pushbutton main bodies, printing on surfaces thereot and coating a primer thereon, while forming separately a shaping mold for accommodating said pushbutton main bodies,and injecting polymethyl methacrylate (PMMA)/polyurethane (P13) blend, then, covering said shaping mold with said pushbutton main bodies, irradiating with ultraviolet light thereonto, removing said shaping mold, trimming excess cured PMMAIPU and baldng to obtain finished silicone rubber pushbuttons.
1 Another object of the invention is to provide silicone rubber pushbuttons prepared by the process according to the invention, which have beaudU appearances and good practicability.
BRIEF DESCRIPTION OF THE DRAWING
The invention, as well as its many advantages, may be ftu-ther understood by the following detailed description and drawings in which:
The only one Figure is a block diagram showing the flowsheet of a process for preparing silicone pushbuttons according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Now, referring to the accompanied Figure, the invention will! be described more detailed hereinafter. As described above, the invention provides a process for preparing silicone pushbuttons, said process comprises forming pushbutton main bodies, printing on surfaces thereoA and coating on printed surfaces with a primer which was composed mainly of an amino fimctional siloxane and had a thickness of 10 - 20 g m; while forming separately a shaping mold for accommodating said pushbutton main bodies, which was made of transparent materials and had a recessed part corresponding to the shape of the pushbutton, wherein the distance between the bottom surface of said recessed part and the top surface of the pushbutton was less than I nun, and injecting polymethyl methacrylate (PMMA)/polyurethane(PLT) blend to form a protecting layer having a thickness of about 2 nun on the top surface of the pushbutton, then, covering said shaping mold with said pushbutton main bodies onto said recessed part having PMMA/PU protecting layer injected therein, irradiating with ultraviolet light thereonto, for 2 - 10 min, removing said shaping mold, trimming excess cured PMNL4JPU and bal.dng at 60Cfor 2 hours to obtain beautiffil and useftd finished pushbuttons.
2 C'_ in the process for preparing silicone rubber pushbuttons according to the invention, suitable silicone rubber can be any silicone rubber that is used conventionally for preparing pushbuttons, and that can be a silicone- based rubber comprising as a main component a silicone 5 polymer having a backbone of polysiloxane such as W polydimethyLs-floxane.
In the process for preparing silicone rubber pushbuttons according to the inventioN the transparent plastic materials used for making the shaping mold can be any transparent thermoplastic materials such as, for example, polyethylene, polypropylene, polystyrene, PMMA, polycarbonates, and the like.
In the process for preparing silicone rubber pushbuttone according to the invention, the primer used for coating on the printed surface of the pushbutton main body is amino fimctional siloxanes having following general formula H2N-R-Si-(OR9)3 wherein R is an alkylene group and each R' is independendy an hydrocarbylgroup.
In the process for preparing silicone rubber pushbutton according to the inventioN the time period for ultraviolet light irradiating can be in the range of 2 to 10 minutes.
In the process for preparing silicone rubber pushbutton according to the invention, the baking temperature for post-curing can be in the range of 50 - 801C, and the time period can be in the range of 1 - 3 hours.
In another embodiment of the process for preparing silicone rubber pushbuttons according to the invention, the PMNLVPU protecting 3 Layer could be any shape having a thickness of about 3 nun, while the baldng temperature was 651C and the baldng time was changed to be I hour and 40 minutes, and thereby, silicone rubber pushbuttons could also be obtained.
The process for preparing silicone rubber pushbuttons according to the invention has following advantages:
1. it can substitute combinations of rubbers and plastics.
2. provision of a mold for plastics can be omittted.
3. less time is needed for processing of products and the operation is simple, and hence the production cost is lower.
4. finished silicone rubber pushbuttons have beautiful appearance and practicability.
Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereoE Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.
4 WHAT IS CLAMED M 1. A process for preparing silicone rubber pushbuttons, said process comprises:
a. forming pushbutton main bodies, printing on surfaces thereof, and coating a primer thereon; b. forming separately a shaping mold for accommodating said pushbutton main bodies, and i ecting a thermoplastics material; UM C. covering said shaping mold with said pushbutton main bodies, and irradiating with ultraviolet light thereonto; and d. removing said shaping mold, trimming excess cured thermoplastics material and baking.
to obtain silicone rubber pushbuttons.
2. A process as claimed in claim 1, wherein the thermoplastics material is a polymethyl methacrylate (PNEklA)/polyurethane (P" blend.
3. A process according to claims 1 or 2, wherein the time period for irradiating ultraviolet light is in the range of 2-10 minutes.
4. A process according to any of claims 1-3, wherein said baking temperature for post-curing is in the range of 50 - 800C, and the time period for said baking is in the range of I - 3 hours.
5. A silicone rubber pushbutton prepared by the process according to any one of claims 1-4.
6. A process for preparing silicone rubber pushbuttons substantially as described herein with reference to and as illustrated by the accompanying drawing.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19829866A DE19829866A1 (en) | 1998-07-03 | 1998-07-03 | Process for preparing silicone rubber pushbuttons |
| GB9814493A GB2338922A (en) | 1998-07-03 | 1998-07-03 | Process for preparing silicone rubber pushbuttons |
| JP10228559A JP2000056902A (en) | 1998-07-03 | 1998-07-30 | Manufacturing method of silicone rubber key switch |
| FR9811029A FR2783087A1 (en) | 1998-07-03 | 1998-09-03 | Process for preparing silicone rubber pushbuttons |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19829866A DE19829866A1 (en) | 1998-07-03 | 1998-07-03 | Process for preparing silicone rubber pushbuttons |
| GB9814493A GB2338922A (en) | 1998-07-03 | 1998-07-03 | Process for preparing silicone rubber pushbuttons |
| JP10228559A JP2000056902A (en) | 1998-07-03 | 1998-07-30 | Manufacturing method of silicone rubber key switch |
| FR9811029A FR2783087A1 (en) | 1998-07-03 | 1998-09-03 | Process for preparing silicone rubber pushbuttons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9814493D0 GB9814493D0 (en) | 1998-09-02 |
| GB2338922A true GB2338922A (en) | 2000-01-12 |
Family
ID=27438826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9814493A Withdrawn GB2338922A (en) | 1998-07-03 | 1998-07-03 | Process for preparing silicone rubber pushbuttons |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2000056902A (en) |
| DE (1) | DE19829866A1 (en) |
| FR (1) | FR2783087A1 (en) |
| GB (1) | GB2338922A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440405C (en) * | 2005-12-26 | 2008-12-03 | 毅嘉科技股份有限公司 | Method for manufacturing thin key |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201131602A (en) * | 2010-03-15 | 2011-09-16 | Ichia Tech Inc | Manufacturing method of keyboard keycap structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279915A (en) * | 1992-02-14 | 1995-01-18 | Shinetsu Polymer Co | Making illuminatable keytops |
-
1998
- 1998-07-03 GB GB9814493A patent/GB2338922A/en not_active Withdrawn
- 1998-07-03 DE DE19829866A patent/DE19829866A1/en not_active Withdrawn
- 1998-07-30 JP JP10228559A patent/JP2000056902A/en active Pending
- 1998-09-03 FR FR9811029A patent/FR2783087A1/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279915A (en) * | 1992-02-14 | 1995-01-18 | Shinetsu Polymer Co | Making illuminatable keytops |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440405C (en) * | 2005-12-26 | 2008-12-03 | 毅嘉科技股份有限公司 | Method for manufacturing thin key |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2783087A1 (en) | 2000-03-10 |
| JP2000056902A (en) | 2000-02-25 |
| GB9814493D0 (en) | 1998-09-02 |
| DE19829866A1 (en) | 2000-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |