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BR9713051A - Sealing film composition, multilayer structure, film, method for producing a film and heat sealable composition - Google Patents

Sealing film composition, multilayer structure, film, method for producing a film and heat sealable composition

Info

Publication number
BR9713051A
BR9713051A BR9713051-6A BR9713051A BR9713051A BR 9713051 A BR9713051 A BR 9713051A BR 9713051 A BR9713051 A BR 9713051A BR 9713051 A BR9713051 A BR 9713051A
Authority
BR
Brazil
Prior art keywords
film
composition
sealing
packaging
multilayer structure
Prior art date
Application number
BR9713051-6A
Other languages
Portuguese (pt)
Inventor
Luc Bosiers
Jacquelyn A Degroot
Lawrence T Kale
Steve Pak-Wing Chum
Staci A Dekunder
Josef J Van Dun
Thomas T Oswald
Original Assignee
Dow Chemical Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/748,321 external-priority patent/US5874139A/en
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of BR9713051A publication Critical patent/BR9713051A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • C09J123/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C09J123/0815—Copolymers of ethene with aliphatic 1-olefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/02—Ziegler natta catalyst
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
    • C08L2666/06—Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sealing Material Composition (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

"COMPOSIçãO DE FILME SELANTE, ESTRUTURA MULTICAMADAS, FILME, MéTODO PARA PRODUZIR UM FILME E COMPOSIçãO SELáVEL POR CALOR". Esta invenção pertence a uma composição de filme selante compreendendo pelo menos dois materiais de componentes de polímero de etileno. Um aspecto da invenção se relaciona a uma estrutura multicamadas tendo propriedades selantes equilibradas e compreendendo uma camada selante e uma camada de polipropileno, sendo que a camada selante compreende e é feita de uma composição de polímero tendo características de peso molecular particulares e um segundo polímero de etileno. Uma configuração preferida da presente invenção pertence a um filme e composição poliolefínica de densidade média caracterizada por um excelente equilíbrio de uma baixa temperatura de início de selagem e módulo de filme melhorado. O filme e composição são compreendidos de e feitos de pelo menos um polímero de etileno homogeneamente ramificado de densidade mais baixa e pelo menos um polímero de etileno heterogeneamente ou homogeneamente ramificado de densidade mais alta. A invenção é particularmente útil naquelas aplicações requerendo tempos de selagem mais rápidos e boa estabilidade dimensional de embalamento tais como, por exemplo, embalagem para cozimento, embalagem para enchimento a quente, bolsas de material escoável, embalagem de enchimento por compressão, embalagem de filme de encolhimento e embalagem de filme de encolhimento de barreira bem como estruturas de filme de polipropileno biaxialmente orientado (BOPP)."SEALING FILM COMPOSITION, MULTILAYER STRUCTURE, FILM, METHOD TO PRODUCE A FILM AND HEAT-SELABLE COMPOSITION". This invention belongs to a sealing film composition comprising at least two materials of ethylene polymer components. One aspect of the invention relates to a multilayer structure having balanced sealing properties and comprising a sealing layer and a polypropylene layer, the sealing layer comprising and being made of a polymer composition having particular molecular weight characteristics and a second polymer of ethylene. A preferred embodiment of the present invention pertains to a medium density polyolefinic film and composition characterized by an excellent balance of a low sealing start temperature and improved film modulus. The film and composition are comprised of and made of at least one lower density homogeneously branched ethylene polymer and at least one higher density heterogeneously or homogeneously branched ethylene polymer. The invention is particularly useful in those applications requiring faster sealing times and good dimensional stability of packaging such as, for example, baking packaging, hot filling packaging, flowable material bags, compression filling packaging, film packaging. shrinkage and packaging of barrier shrink film as well as biaxially oriented polypropylene (BOPP) film structures.

BR9713051-6A 1996-11-13 1997-11-13 Sealing film composition, multilayer structure, film, method for producing a film and heat sealable composition BR9713051A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/748,321 US5874139A (en) 1994-10-21 1996-11-13 Multilayer polyolefin with balanced sealant properties
US88000697A 1997-06-20 1997-06-20
PCT/US1997/020574 WO1998021274A1 (en) 1996-11-13 1997-11-13 Polyolefin compositions with balanced sealant properties and improved modulus and method for same

Publications (1)

Publication Number Publication Date
BR9713051A true BR9713051A (en) 2002-01-15

Family

ID=27114920

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9713051-6A BR9713051A (en) 1996-11-13 1997-11-13 Sealing film composition, multilayer structure, film, method for producing a film and heat sealable composition

Country Status (9)

Country Link
EP (1) EP0938520A1 (en)
JP (1) JP2000507645A (en)
KR (1) KR20000053255A (en)
AU (1) AU739746B2 (en)
BR (1) BR9713051A (en)
CA (1) CA2271482A1 (en)
NO (1) NO992304L (en)
NZ (1) NZ335732A (en)
WO (1) WO1998021274A1 (en)

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ZA986434B (en) 1997-07-21 2000-01-20 Dow Chemical Co Broad mwd, compositionally uniform ethylene interpolymer compositions, process for making the same and article made therefrom.
ID24895A (en) 1997-09-19 2000-08-31 Dow Chemical Co INTERPOLYMER COMPOSITION THAT IS OPTIMIZED COMPOSITIONALLY, MWD SEMPIT, THE PROCESS OF MAKING IT AND ARTICLES MADE, FROM ITS
AU7116100A (en) * 1999-09-07 2001-04-10 E.I. Du Pont De Nemours And Company Heat-sealable polyolefins and articles made therefrom
US7125933B2 (en) 2000-06-22 2006-10-24 Univation Technologies, Llc Very low density polyethylene blends
DE60128377T2 (en) * 2000-06-22 2008-01-10 Exxonmobil Chemical Patents Inc., Baytown METAL CELL CALCULATORS PRODUCED POLYETHYLENE VERY LOW DENSITY
US20020160167A1 (en) 2001-02-23 2002-10-31 Bader Michael J. Multi-layer hermetically sealable film
US6686005B2 (en) * 2001-10-11 2004-02-03 Pactiv Corporation End termination materials for reclosable polymeric bags
JP4028206B2 (en) * 2001-10-19 2007-12-26 大日本印刷株式会社 Bag with zipper tape
CA2499517C (en) * 2002-09-23 2009-01-20 Ronald J. Weeks Polymer compositions for extrusion coating
CA2526873C (en) 2003-06-10 2012-05-22 Dow Global Technologies Inc. Film layers made from ethylene polymer blends
EP1721739A1 (en) * 2005-05-09 2006-11-15 Total Petrochemicals Research Feluy Bi-layer rotomoulding applications
US8617717B2 (en) 2006-06-09 2013-12-31 Exxonmobil Chemical Patents Inc. Heat sealable films from propylene and α-olefin units
EP2114671B1 (en) * 2006-12-21 2016-12-07 Dow Global Technologies LLC Layered films, packages prepared therefrom, and methods of making the same
EP1995058B1 (en) * 2007-05-25 2015-12-09 Flexopack S A Multilayer heat shrinkable cook-in film
PL2077297T3 (en) 2008-01-02 2012-10-31 Flexopack Sa PVDC formulation and heat shrinkable film
KR100901632B1 (en) * 2008-04-01 2009-06-08 호남석유화학 주식회사 Polyethylene resin composition for container lid manufacturing
CN102256787A (en) 2008-10-17 2011-11-23 陶氏环球技术有限责任公司 Biaxially oriented film
EP2393852B1 (en) * 2009-02-06 2013-06-19 Dow Global Technologies LLC Ethylene-based polymers and compositions, methods of making the same, and articles prepared therefrom
US20100221528A1 (en) * 2009-02-27 2010-09-02 Schwab Thomas J Extrusion coated article
SG10201403765WA (en) * 2009-07-01 2014-09-26 Dow Global Technologies Llc Ethylenic Polymer And Its Use
WO2011037590A1 (en) * 2009-09-28 2011-03-31 Exxonmobil Chemical Patents Inc. Polyolefin compositions and products made therefrom
EP2520518B1 (en) 2011-05-03 2020-09-23 Flexopack S.A. Waste packaging device
DE202011110797U1 (en) 2011-06-16 2016-08-10 Flexopack S.A. Waste packaging system and foil
US9604430B2 (en) 2012-02-08 2017-03-28 Flexopack S.A. Thin film for waste packing cassettes
US9181369B2 (en) 2013-03-11 2015-11-10 Chevron Phillips Chemical Company Lp Polymer films having improved heat sealing properties
US9815975B2 (en) * 2013-03-25 2017-11-14 Dow Global Technologies Llc Film having good barrier properties together with good physical characteristics
EP2813362B1 (en) 2013-06-14 2019-05-22 Flexopack S.A. Heat shrinkable film
US20170152377A1 (en) * 2014-06-26 2017-06-01 Dow Global Technologies Llc Breathable films and articles incorporating same
AU2015258191B2 (en) 2014-11-19 2020-02-27 Flexopack S.A. Oven skin packaging process
JP6398841B2 (en) * 2015-03-31 2018-10-03 日本ポリエチレン株式会社 Packaging film
WO2018045559A1 (en) 2016-09-09 2018-03-15 Dow Global Technologies Llc Multilayer films and laminates and articles comprising the same
EP3501822A1 (en) 2017-12-22 2019-06-26 Flexopack S.A. Fibc liner film
WO2020064349A1 (en) * 2018-09-25 2020-04-02 Sabic Global Technologies B.V. Polyethylene film for heat sealing.
US11649331B2 (en) * 2018-11-13 2023-05-16 Exxonmobil Chemical Patents Inc. Polyethylene blends and films
WO2020102385A1 (en) * 2018-11-13 2020-05-22 Exxonmobil Chemical Patents Inc. Polyethylene films
US11046843B2 (en) * 2019-07-29 2021-06-29 Nova Chemicals (International) S.A. Ethylene copolymers and films with excellent sealing properties
WO2024097008A1 (en) * 2022-11-03 2024-05-10 Dow Global Technologies Llc Polyethylene composition
WO2024097006A1 (en) * 2022-11-03 2024-05-10 Dow Global Technologies Llc Polyethylene composition

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Also Published As

Publication number Publication date
CA2271482A1 (en) 1998-05-22
NZ335732A (en) 2000-12-22
JP2000507645A (en) 2000-06-20
KR20000053255A (en) 2000-08-25
EP0938520A1 (en) 1999-09-01
AU739746B2 (en) 2001-10-18
NO992304L (en) 1999-07-13
AU5507598A (en) 1998-06-03
WO1998021274A1 (en) 1998-05-22
NO992304D0 (en) 1999-05-12

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Legal Events

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B06A Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]
B11B Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements