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US5779962A
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Extruding thin multiphase polymer films
Assignee: 3M Co
•
Filing: 1996-04-01
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Granted: 1998-07-14
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Expires: 2016-04-01
Abstract
Abstract Methods of extruding thin multiphase polymer films using a flat film extrusion die closely spaced to a nip to transport and cool the melt from the die to produce thin multiphase polymer films having substantially uniform calipers of about 250 micrometers or less.
Inventors
- 👤 Warren Steve Andraschko
- 👤 Bruce B. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:19
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/35; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
A method of extruding a thin multiphase polymer film comprising: a) providing a flat film extrusion die having die lips spaced apart by a die lip spacing; b) providing at least two rolls near the die lips, the rolls forming a nip to transport extrudate away from the die; c) providing a draw distance between the die lips and the nip of about 11.5 centimeters or less; d) extruding a multiphase polymer through the die and directly into the nip to provide a film consisting essentially of a multiphase polymer with a substantially uniform caliper of about 250 micrometers or less, wherein the die lip spacing is less than the film caliper.
Claim 2
Independent Claim
112 words
A method of extruding a thin multiphase polymer film comprising: a) providing a flat film extrusion die having die lips spaced apart by a die lip spacing; b) providing at least two rolls near the die lips, the rolls forming a nip to transport extrudate away from the die; c) providing a draw distance between the die lips and the nip of about 11.5 centimeters or less; d) extruding a multiphase polymer through the die and directly into the nip to provide a film consisting essentially of a multiphase polymer with a substantially uniform caliper of about 250 micrometers or less, wherein the die lip spacing is less than the film caliper.
Claim 3
Dependent Claim
25 words
A method according to claim 1, further comprising a step of spacing the die lips apart by a distance of about 100 micrometers or less.
Claim 4
Dependent Claim
25 words
A method according to claim 1, further comprising a step of spacing the die lips apart by a distance of about 60 micrometers or less.
Claim 5
Dependent Claim
25 words
A method according to claim 1, further comprising a step of spacing the die lips apart by a distance of about 40 micrometers or less.
Claim 6
Dependent Claim
16 words
A method according to claim 1, wherein the draw distance is about 9 centimeters or less.
Claim 7
Dependent Claim
16 words
A method according to claim 1, wherein the draw distance is about 6 centimeters or less.
Claim 8
Dependent Claim
16 words
A method according to claim 1, wherein the multiphase polymer comprises a multiphase styrenic thermoplastic copolymer.
Claim 9
Dependent Claim
46 words
A method according to claim 1, wherein the multiphase polymer comprises a thermoplastic polymer selected from the group consisting of ethylene-propylene-nonconjugated diene ternary copolymers grafted with a mixture of styrene and acrylonitrile, styrene-acrylonitrile graft copolymers, acrylonitrile-butadiene-styrene graft copolymers, extractable styrene-acrylonitrile copolymers, and combinations or blends thereof.
Claim 10
Dependent Claim
33 words
A method according to claim 1, wherein the step of extruding a multiphase polymer through the die further comprises forming the film with a substantially uniform caliper of about 100 micrometers or less.
Claim 11
Dependent Claim
33 words
A method according to claim 1, wherein the step of extruding a multiphase polymer through the die further comprises forming the film with a substantially uniform caliper of about 50 micrometers or less.
Claim 12
Dependent Claim
19 words
A method according to claim 1, wherein the film caliper varies about ±15% or less in the cross-web direction.
Claim 13
Dependent Claim
19 words
A method according to claim 1, wherein the film caliper varies about ±5% or less in the cross-web direction.
Claim 14
Independent Claim
139 words
A method of extruding a thin multiphase polymer film comprising: a) providing a flat film extrusion die having a die lip spacing of about 100 micrometers or less; b) providing at least two rolls near the die lips, the rolls forming a nip to transport extrudate away from the die; c) providing a draw distance between the die lips and the nip of about 9 centimeters or less; d) extruding a multiphase polymer through the die and directly into the nip to provide a film consisting essentially of a multiphase polymer with a film caliper of about 100 micrometers or less, wherein the film caliper varies about ±15% or less in the cross-web direction, and further wherein the multiphase polymer comprises a styrenic thermoplastic copolymer, and still further wherein the die lip spacing is less than the film caliper.
Claim 15
Independent Claim
139 words
A method of extruding a thin multiphase polymer film comprising: a) providing a flat film extrusion die having a die lip spacing of about 100 micrometers or less; b) providing at least two rolls near the die lips, the rolls forming a nip to transport extrudate away from the die; c) providing a draw distance between the die lips and the nip of about 9 centimeters or less; d) extruding a multiphase polymer through the die and directly into the nip to provide a film consisting essentially of a multiphase polymer with a film caliper of about 100 micrometers or less, wherein the film caliper varies about ±15% or less in the cross-web direction, and further wherein the multiphase polymer comprises a styrenic thermoplastic copolymer, and still further wherein the die lip spacing is less than the film caliper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-13 | 2002-01-12 | 2002-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-13 | 2006-01-12 | 2006-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-13 | 2010-01-12 | 2010-07-14 | $7700.00 | Window Closed / Lapsed |