Patent US4125573A successfully refreshed from Google Patents.
US4125573A
Expired / Lapsed
US
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Polymer polyblend composition
Assignee: Bayer Antwerpen NV
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Filing: 1976-03-26
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Granted: 1978-11-14
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Expires: 1996-03-26
Abstract
Abstract This invention relates to an improved polymeric polyblend characterized by a blend of (A) a polymer of at least one monoalkenyl aromatic monomer having dispersed therein an amount sufficient to toughen said polyblend of a (B) diene rubber, said rubber being dispersed as crosslinked grafted rubber particles wherein said improvement comprises (C) said diene rubber being a particular polybutadiene rubber having a broad molecular weight range providing the polyblend with greatly improved impact strength.
Inventors
- 👤 Robert L. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:19
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
An improved polymeric polyblend composition characterized by a blend of: A. a polymer of at least one monoalkenyl aromatic monomer having dispersed therein an amount sufficient to toughen said polymer of B. a diene rubber, said rubber being dispersed as crosslinked rubber particles being grafted with said monomer as polymer and having occluded therein said polymer, said particles having a weight average diameter of from about 0.5 to 10 microns, wherein said improvement comprises: C. said diene rubber being a polybutadiene rubber having a broad molecular weight distribution characterized by having a dispersion index from about 2 to 6 a weight average molecular weight of from about 250,000 to 750,000 and a number average molecular weight of from about 125,000 to 200,000, and a microstructure having a cis-1,4 isomer content of from about 30 to 85 percent.
Claim 2
Dependent Claim
137 words
An improved polymeric polyblend composition characterized by a blend of: A. a polymer of at least one monoalkenyl aromatic monomer having dispersed therein an amount sufficient to toughen said polymer of B. a diene rubber, said rubber being dispersed as crosslinked rubber particles being grafted with said monomer as polymer and having occluded therein said polymer, said particles having a weight average diameter of from about 0.5 to 10 microns, wherein said improvement comprises: C. said diene rubber being a polybutadiene rubber having a broad molecular weight distribution characterized by having a dispersion index from about 2 to 6 a weight average molecular weight of from about 250,000 to 750,000 and a number average molecular weight of from about 125,000 to 200,000, and a microstructure having a cis-1,4 isomer content of from about 30 to 85 percent.
Claim 3
Dependent Claim
19 words
A polyblend of claim 1, wherein said diene rubber has a Mooney viscosity of from about 20 to 120.
Claim 4
Dependent Claim
28 words
A polyblend of claim 1, wherein said monoalkenyl aromatic monomer is selected from the group consisting of styrene, a-methyl styrene, chlorostyrene, dichlorostyrene, bromostyrene or dibromostyrene and mixtures thereof.
Claim 5
Dependent Claim
23 words
A polyblend of claim 1, wherein said diene rubber is selected from the group consisting of polybutadiene, poly-2-methyl butadiene, poly-2-chlorobutadiene and mixtures thereof.
Claim 6
Dependent Claim
11 words
A polyblend of claim 1, wherein said diene rubber is polybutadiene.
Claim 7
Dependent Claim
20 words
A polyblend of claim 1, wherein said polybutadiene rubber has a cis 1,4-isomer content of about 30 to 85 percent.
Claim 8
Dependent Claim
12 words
A polyblend of claim 1, wherein said monoalkenyl aromatic monomer is styrene.
Claim 9
Dependent Claim
37 words
A polyblend of claim 1, wherein said polymer has a molecular weight distribution characterized by a polymer dispersion index ranging from about 2.2 to 3.5 wherein said weight average molecular weight ranges from about 200,000 to 400,000.
Claim 10
Dependent Claim
28 words
A polyblend of claim 1, wherein said particles have present said graft and occluded polymer in amounts ranging from 0.5 to 6.0 parts per part of rubber moiety.
Claim 11
Dependent Claim
27 words
A polyblend of claim 1, wherein said polyblend has from about 1 to 15 percent by weight of said diene rubber moiety dispersed as crosslinked rubber particles.
Claim 12
Dependent Claim
20 words
A polyblend of claim 1, wherein said crosslinked rubber particles have a swelling index of from about 7 to 30.
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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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |