Patent US4130534A successfully refreshed from Google Patents.
US4130534A
Expired / Lapsed
US
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Elastoplastic compositions of butyl rubber and polyolefin resin
Assignee: Advanced Elastomer Systems LP
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Filing: 1976-12-27
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Granted: 1978-12-19
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Expires: 1996-12-27
Abstract
Abstract Elastoplastic compositions are described comprising blends of cross-linked butyl rubber and thermoplastic polyolefin resin.
Inventors
- 👤 Aubert Y. Coran
- 👤 Raman P. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:14
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L23/26; C08L23/28; C08L23/283
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
An elastoplastic composition comprising a blend of from about 20 to 45 parts by weight of thermoplastic crystalline polyolefin resin and from about 80 to 55 parts by weight of butyl rubber, chlorobutyl rubber, or bromobutyl rubber per 100 total parts by weight of polyolefin resin and rubber wherein the rubber is dispersed particles of cross-linked rubber which composition is processable as a thermoplastic and is elastomeric.
Claim 2
Dependent Claim
67 words
An elastoplastic composition comprising a blend of from about 20 to 45 parts by weight of thermoplastic crystalline polyolefin resin and from about 80 to 55 parts by weight of butyl rubber, chlorobutyl rubber, or bromobutyl rubber per 100 total parts by weight of polyolefin resin and rubber wherein the rubber is dispersed particles of cross-linked rubber which composition is processable as a thermoplastic and is elastomeric.
Claim 3
Dependent Claim
20 words
The composition of claim 1 containing from 20 to 150 parts extender oil per 100 parts by weight butyl rubber.
Claim 4
Dependent Claim
14 words
The composition of claim 2 in which the polyolefin resin is polypropylene or polyethylene.
Claim 5
Dependent Claim
37 words
The composition of claim 2 in which the blend comprises about 25-45 parts by weight of polypropylene and about 75-55 parts by weight of butyl rubber per 100 total parts by weight of polyolefin and butyl rubber.
Claim 6
Dependent Claim
48 words
The composition of claim 4 in which the rubber is cross-linked to the extent that the rubber is at least 90% by weight insoluble in boiling xylene or to the extent that the rubber contains at least about 2 × 10 -5 moles of effective cross-links per milliliter.
Claim 7
Dependent Claim
29 words
The composition of claim 5 in which the rubber is cross-linked to the extent that it contains at least 4 × 10 -5 moles of effective cross-links per milliliter.
Claim 8
Dependent Claim
41 words
The composition of claim 5 in which the blend comprises about 30 to about 40 parts by weight polypropylene and about 60 to about 70 parts by weight butyl rubber per 100 parts by combined weight of polypropylene and butyl rubber.
Claim 9
Dependent Claim
21 words
The composition of claim 1 prepared by masticating the blend and cross-linking agent at cross-linking temperature until the rubber is cross-linked.
Claim 10
Dependent Claim
13 words
The composition of claim 8 wherein the curative is a phenolic-aldehyde curing resin.
Claim 11
Dependent Claim
28 words
The composition of claim 1 in which toughness, TS 2 /E, is at least 50 Kg./cm 2 wherein TS is ultimate tensile strength and E is Young's modulus.
Claim 12
Dependent Claim
42 words
The composition of claim 1 having a high temperature stability of such that the change in length at 185° C. for 5 minutes under a stress of 0.2 Kg./cm 2 is no more than 7% of its original length at room temperature.
Claim 13
Dependent Claim
15 words
The composition of claim 1 having a tensile strength 100% greater than the uncured blend.
Claim 14
Dependent Claim
17 words
The composition of claim 11 having a tensile strength of 200% or more of the uncured blend.
References Cited (Backward Citations)
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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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |