US4264490A
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Composition of a polyethylene and isobutylene copolymer
Assignee: Radiation Dynamics Inc
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Filing: 1979-05-11
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Granted: 1981-04-28
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Expires: 1999-05-11
Abstract
Abstract Cross-linkable polyethylene blended with a copolymer of isobutylene and a conjugated diene is capable of being cross-linked, bonded, stretched and recovered without a significant loss of strength characteristics or seal.
Inventors
- 👤 Anthony J. Berejka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:00
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C65/14; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/71; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/7375; B29C66/73755; B29C66/73756; B29C66/739; B29C66/7394; B29C66/73941; C08L23/18; C08L23/20; C08L23/22; C08L23/26; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877; B29C65/66; B29C66/431; B29C66/4312; B29C66/432; B29C66/4322; B29C66/712; B29K; B29K2009/00; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2023/065; B29K2023/18; B29K2023/22; B29K2105/00; B29K2105/0005; B29K2105/0085; B29K2105/0088; B29K2105/24; Y; Y10; Y10T; Y10T428/00; Y10T428/19
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
15 words
A composition comprising a cross-linkable polyethylene and a copolymer of isobutylene and a conjugated diene.
Claim 2
Dependent Claim
15 words
A composition comprising a cross-linkable polyethylene and a copolymer of isobutylene and a conjugated diene.
Claim 3
Dependent Claim
33 words
A composition according to claim 1 which includes a sufficient amount of said isobutylene copolymer to render a product formed of the composition heat sealable or sealable onto itself or other polyolefin compositions.
Claim 4
Dependent Claim
17 words
A composition according to claims 1 or 2 wherein said conjugated diene is a C 5 diene.
Claim 5
Dependent Claim
56 words
A composition according to claim 3 wherein said copolymer is a member selected from the group consisting of: ##STR5## and mixtures thereof; wherein N, M, P and R are of a sufficient finite number and total so that the conjugated diene moieties X and Y, amounts to less than about 5 mole % of the copolymer.
Claim 6
Dependent Claim
19 words
A composition according to claim 4 wherein the conjugated diene amounts to about 1-2 mole % of the copolymer.
Claim 7
Dependent Claim
17 words
A composition according to claim 2 wherein said polyethylene has a density of about 0.95 and 0.96.
Claim 8
Dependent Claim
27 words
A composition according to claim 2 wherein said polyethylene is itself a copolymer or is a lower density homopolymer having a density of about 0.91 to 0.94.
Claim 9
Dependent Claim
24 words
A composition according to claim 5 wherein said copolymer is the product of the synthesis of isobutylene and isoprene subsequently halogenated and then dehydrohalogenated.
Claim 10
Dependent Claim
20 words
A composition according to claims 1 or 2 comprising about 30-70% by weight polyethylene and about 30-70% by weight copolymer.
Claim 11
Dependent Claim
15 words
A composition according to claim 9 comprising equal parts by weight of polyethylene and copolymer.
Claim 12
Dependent Claim
55 words
A composition according to claim 9 wherein the copolymer is a member selected from the group consisting of: ##STR6## and mixtures thereof; wherein N, M, P and R are of a sufficient finite member and total so that the conjugated diene moieties X and Y amounts to less than 5 mole % of the copolymer.
Claim 13
Dependent Claim
19 words
A composition according to claim 11 wherein the conjugated diene amounts to about 1-2 mole % of the copolymer.
Claim 14
Dependent Claim
29 words
A composition according to claim 11 wherein said polyethylene has a density of about 0.95-0.96 and the composition is comprised of equal parts by weight of polyethylene and copolymer.
Claim 15
Dependent Claim
19 words
A composition according to claim 13 consisting essentially of about 50 wt. % polyethylene and 50 wt. % copolymer.
Claim 16
Dependent Claim
31 words
A composition according to claims 1 or 2 which further includes a member selected from the group consisting of a filler, pigment, antioxidant, plasticizer, flame retardant, blowing agent and mixtures thereof.
Claim 17
Dependent Claim
20 words
A composition according to claim 15 wherein said member does not exceed about 50% by weight of the total composition.
Claim 18
Dependent Claim
16 words
A composition according to claim 16 wherein said member is an antioxidant in an affective amount.
Claim 19
Dependent Claim
29 words
A composition according to claim 16 wherein said antioxidant is in an amount of about 1% by weight of said composition and consists essentially of Kis[methylene 3-(3',5',- di-tert-butyl-4'-hydroxy phenyl)propionate]methane.
Claim 20
Dependent Claim
54 words
A composition according to claim 18 wherein said copolymer is a member selected from the group consisting of: ##STR7## and mixtures thereof; wherein N, M, P and R are of sufficient finite number and total so that conjugated diene moieties X and Y amounts to less than about 1-2 mole % of the copolymer.
Claim 21
Dependent Claim
37 words
A composition according to claims 1 or 2 wherein said composition is capable of being formed into a cross-linked, heat sealable material which exhibits at least substantially the same strength characteristics as the material prior to cross-linking.
Claim 22
Dependent Claim
23 words
A composition according to claim 20 wherein said strength characteristics are exhibited both above and below the crystalline softening point of the material.
Claim 23
Dependent Claim
15 words
A composition according to claim 21 wherein the material has a relatively low vapor permeability.
Claim 24
Dependent Claim
11 words
A sheet or film formed of the composition of claim 2.
Claim 25
Dependent Claim
8 words
Articles formed of the composition of claim 2.
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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |