Patent US630506A successfully refreshed from Google Patents.
US4101702A
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US
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Composite sheet member having a plurality of coextruded laminar layers
Assignee: Bayer Antwerpen NV
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Filing: 1977-10-18
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Granted: 1978-07-18
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Expires: 1997-10-18
Abstract
Abstract The present invention relates to a composite sheet member having a plurality of coextruded laminar layers comprising a base layer having at least one exterior layer, said base layer being formed from a first polyblend of low grafted rubber content and said exterior layers being formed from a second polyblend having a higher grafted rubber content, said composite sheet having increased impact strength when impacted with a force through the base layer to the exterior layer.
Inventors
- 👤 Geoffrey B. Churchill
- 👤 J. Craig White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:54
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/30; B32B27/302; B32B2264/00; B32B2264/02; B32B2264/0207; B32B2270/00; B32B2307/00; B32B2307/50; B32B2307/558; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31826; Y10T428/3183; Y10T428/31855; Y10T428/31909; Y10T428/31924; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
119 words
A composite sheet member having a plurality of coextruded laminar layers comprising: A. a base layer formed from a first ABS polyblend having a thickness of about 55 to 99% of the thickness of said composite sheet member, said first polyblend having a grafted diene rubber content of 5 to 25% by weight of said polyblend and at least one, B. external layer formed from a second ABS polyblend having a thickness of 1 to 45% of the thickness of said composite sheet member said second polyblend having a grafted diene rubber content of 7 to 35% by weight of said second polyblend, said external layer having present at least about 10% more grafted rubber than said base layer.
Claim 2
Dependent Claim
119 words
A composite sheet member having a plurality of coextruded laminar layers comprising: A. a base layer formed from a first ABS polyblend having a thickness of about 55 to 99% of the thickness of said composite sheet member, said first polyblend having a grafted diene rubber content of 5 to 25% by weight of said polyblend and at least one, B. external layer formed from a second ABS polyblend having a thickness of 1 to 45% of the thickness of said composite sheet member said second polyblend having a grafted diene rubber content of 7 to 35% by weight of said second polyblend, said external layer having present at least about 10% more grafted rubber than said base layer.
Claim 3
Dependent Claim
21 words
A sheet member of claim 1 wherein said first ABS polyblend has a melt flow substantially that of second ABS polyblend.
Claim 4
Dependent Claim
21 words
A sheet member of claim 1 wherein said base and external layers have adhesion at a melt interface formed during coextrusion.
Claim 5
Dependent Claim
25 words
A sheet member of claim 1 wherein said external layer has a thickness of 1 to 50% of the thickness of said composite sheet member.
Claim 6
Dependent Claim
20 words
A sheet member of claim 1 wherein said base layer has a bottom external layer and a top external layer.
Claim 7
Dependent Claim
18 words
A sheet member of claim 5 wherein said bottom and top layers are formed from said second polyblend.
Claim 8
Dependent Claim
27 words
A sheet member of claim 5 wherein said bottom and top layers have a thickness of 0.5 to 22.5% of the thickness of said composite sheet member.
Claim 9
Dependent Claim
77 words
A sheet member of claim 1 wherein said first and second polyblend are ABS polyblends having a matrix interpolymer comprising about 50 to 85% of a monovinylidene aromatic monomer by weight and about 15 to 50% of a ethylenically unsaturated nitrile monomer by weight, a diene rubber substrate having a grafted superstrate interpolymer of the composition of said matrix interpolymer, said grafted superstrate interpolymer being present in amounts of 0.1 to 2.5 parts per part of rubber.
Claim 10
Dependent Claim
25 words
A sheet member of claim 8 wherein said monovinylidene aromatic monomer is styrene, alpha-methylstyrene, chlorostyrene or bromostyrene, said ethylenically unsaturated nitrile is acrylonitrile or methacrylonitrile.
Claim 11
Dependent Claim
35 words
A sheet member of claim 1 wherein said diene rubber is polybutadiene, copolymers of butadiene/styrene or butadiene/acrylonitrile, chloroprene, isoprene or mixtures thereof, said diene rubber having at least 50% of a conjugated diene monomer present.
Claim 12
Dependent Claim
119 words
A composite sheet member having a plurality of coextruded laminar layers comprising: A. a base layer formed from a first HIPS polyblend having a thickness of about 55 to 99% of the thickness of said composite sheet member, said first polyblend having a grafted diene rubber content of 2 to 15% by weight of said polyblend and at least one, B. external layer formed from a second HIPS polyblend having a thickness of 1 to 45% of the thickness of said composite sheet member said second polyblend having a grafted diene rubber content of 3 to 20% by weight of said second polyblend, said external layer having present at least about 10% more grafted rubber than said base layer.
Claim 13
Dependent Claim
119 words
A composite sheet member having a plurality of coextruded laminar layers comprising: A. a base layer formed from a first HIPS polyblend having a thickness of about 55 to 99% of the thickness of said composite sheet member, said first polyblend having a grafted diene rubber content of 2 to 15% by weight of said polyblend and at least one, B. external layer formed from a second HIPS polyblend having a thickness of 1 to 45% of the thickness of said composite sheet member said second polyblend having a grafted diene rubber content of 3 to 20% by weight of said second polyblend, said external layer having present at least about 10% more grafted rubber than said base layer.
Claim 14
Dependent Claim
30 words
A sheet member of claim 10 wherein said first and second HIPS polyblends are polymers of a monovinylidene aromatic monomer having dispersed therein a diene rubber grafted with said monomer.
Claim 15
Dependent Claim
35 words
A sheet member of claim 11 wherein said diene rubber is polybutadiene, copolymers of butadiene/styrene or butadiene/acrylonitrile, chloroprene, isoprene or mixtures thereof, said diene rubber having at least 50% of a conjugated diene monomer present.
Claim 16
Dependent Claim
28 words
A sheet member of claim 11 wherein said grafted diene rubber has grafted and occluded polystyrene present in amounts of 0.1 to 5 parts per part of rubber.
Claim 17
Dependent Claim
17 words
A sheet member of claim 11 wherein said monovinylidene aromatic monomer is styrene, alpha-methylstyrene, chlorostyrene or bromostyrene.
Claim 18
Dependent Claim
21 words
A sheet member of claim 11 wherein said first HIPS polyblend has a melt flow substantially that of second HIPS polyblend.
Claim 19
Dependent Claim
21 words
A sheet member of claim 11 wherein said base and external layers have adhesion at a melt interface formed during coextrusion.
Claim 20
Dependent Claim
25 words
A sheet member of claim 11 wherein said external layer has a thickness of 1 to 50% of the thickness of said composite sheet member.
Claim 21
Dependent Claim
20 words
A sheet member of claim 16 wherein said base layer has a bottom external layer and a top external layer.
Claim 22
Dependent Claim
18 words
A sheet member of claim 16 wherein said bottom and top layers are formed from said second polyblend.
Claim 23
Dependent Claim
27 words
A sheet member of claim 16 wherein said bottom and top layers have a thickness of 0.5 to 22.5% of the thickness of said composite sheet member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |