US4097549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer polyblend composition
Assignee: Monsanto Co
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Filing: 1975-12-29
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Granted: 1978-06-27
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Expires: 1995-12-29
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 particles having a rubber moiety structured in a novel morphological form comprising rubber fibers or rubber sheets and mixtures thereof.
Inventors
- 👤 Robert L. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:41
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F291/00; C08F291/02; C08L; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
154 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 rubber particles having a rubber moiety structured in a morphological form comprising rubber fibres or rubber sheets and mixtures thereof said polymeric polyblend being prepared by polymerizing continuously a solution of said monoalkenyl aromatic monomer and said diene rubber under catalytic conditions with back mixed agitation to about 10 to 50% conversion; then discontinuing such agitation and continuing the polymerization of said solution until the monomer is substantially polymerized; then heating and separating said polyblend from said monomer.
Claim 2
Dependent Claim
154 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 rubber particles having a rubber moiety structured in a morphological form comprising rubber fibres or rubber sheets and mixtures thereof said polymeric polyblend being prepared by polymerizing continuously a solution of said monoalkenyl aromatic monomer and said diene rubber under catalytic conditions with back mixed agitation to about 10 to 50% conversion; then discontinuing such agitation and continuing the polymerization of said solution until the monomer is substantially polymerized; then heating and separating said polyblend from said monomer.
Claim 3
Dependent Claim
48 words
A polyblend composition of claim 1, wherein said rubber particles have said rubber moiety structured in a morphological form comprising (1) rubber fibres or (2) rubber sheets and mixtures thereof in combination with rubber particles having said rubber moiety structured in the form of (3) continuous rubber membranes.
Claim 4
Dependent Claim
45 words
A polyblend composition of claim 2, wherein from about 30-70 percent by weight of said rubber particles have the form of (1) or (2) and mixtures thereof and wherein from about 30 to 70 percent by weight of said particles have the form of (3).
Claim 5
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 6
Dependent Claim
33 words
A polyblend of claim 1, wherein said diene rubber is selected from the group consisting of polybutadiene, polyisoprene, poly-2-chlorobutadiene, polypentenomer, copolymers and block copolymers of butadiene-styrene, butadiene-chloroprene, chloroprene-styrene, chloroprene-isoprene, 2-chlorobutadiene-1-chlorobutadiene and mixtures thereof.
Claim 7
Dependent Claim
11 words
A polyblend of claim 1, wherein said diene rubber is polybutadiene.
Claim 8
Dependent Claim
32 words
A polyblend of claim 4, wherein said polybutadiene rubber has a cis isomer content of about 30 to 98 percent and a Tg range of from about -50° C. to -105° C.
Claim 9
Dependent Claim
12 words
A polyblend of claim 1, wherein said monoalkenyl aromatic monomer is styrene.
Claim 10
Dependent Claim
28 words
A polyblend of claim 1, wherein said polymer has an average molecular weight of 40,000 to 70,000 Staudinger and a molecular weight dispersion index of 2.2 to 3.5.
Claim 11
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 12
Dependent Claim
60 words
A polyblend of claim 8, wherein said rubber particles having continuous rubber membrane morphology have present from about 0.5 to 2.5 parts of grafted and occluded polymer per part of rubber and wherein said rubber particles having rubber fibre and rubber sheet morphology have present from about 3.0 to 6.0 parts of grafted and occluded polymer per part of rubber.
Claim 13
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 14
Dependent Claim
20 words
A polyblend of claim 1, wherein said crosslinked rubber particles have a swelling index of from about 7 to 30.
Claim 15
Dependent Claim
16 words
A polyblend of claim 1, wherein said particle size dispersion index is about 2.0 to 6.0.
Claim 16
Dependent Claim
28 words
A polyblend of claim 1, wherein said rubber fibres, said rubber sheets and said continuous rubber membranes have a average thickness of from about 0.01 to 0.10 microns.
Claim 17
Dependent Claim
41 words
A polyblend of claim 1 wherein said polyblend is prepared under catalytic conditions which include the use of monomer soluble free radical peroxy catalysts in amounts of from about 0.001 to 3.0% by weight based on the weight of the monomer.
Claim 18
Dependent Claim
36 words
A polyblend of claim 16 wherein said polyblend is prepared under catalytic conditions which include the use of peroxy catalysts selected from the group consisting of tert-butyl perbenzoate, tert-butyl peracetate, and dicumyl peroxide or mixtures thereof.
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |