Patent US4133788A successfully refreshed from Google Patents.
US4133788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer latex which is cross-linked with a dialkyl tin diacrylate in the preparation of grafted copolymers
Assignee: GE Chemicals Inc
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Filing: 1978-01-23
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Granted: 1979-01-09
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Expires: 1998-01-23
Abstract
Abstract A polymer latex which is cross-linked by a dialkyl tin diacrylate. The latex is a good substrate for the preparation of graft copolymers which are effective to impart good impact and high stress whitening properties to vinyl chloride polymers.
Inventors
- 👤 Ved K. Sahajpal
- 👤 Larry D. Sarver
- 👤 Claude C. Deegan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:52
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F279/06; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A process for preparing a graft copolymer of styrene and methyl methacrylate as a superstrate grafted on a copolymer of butadiene and styrene as the substrate, which graft copolymer is compatible with vinyl chloride polymers, comprising: (a) preparing a polymer latex by polymerizing butadiene or a mixture of butadiene and styrene, in the presence of a small proportion of a dialkyl tin diacrylate cross-linking agent; (b) adding to said latex a mixture of methyl methacrylate and styrene; and (c) polymerizing said mixture of (b).
Claim 2
Dependent Claim
84 words
A process for preparing a graft copolymer of styrene and methyl methacrylate as a superstrate grafted on a copolymer of butadiene and styrene as the substrate, which graft copolymer is compatible with vinyl chloride polymers, comprising: (a) preparing a polymer latex by polymerizing butadiene or a mixture of butadiene and styrene, in the presence of a small proportion of a dialkyl tin diacrylate cross-linking agent; (b) adding to said latex a mixture of methyl methacrylate and styrene; and (c) polymerizing said mixture of (b).
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the mixture of (b) contains up to 10%, based on said mixture, of acrylonitrile.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein step (a) comprises of polymerizing a mixture of butadiene and up to 70% of styrene.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the alkyl groups of the dialkyl tin diacrylate each contain 1-10 carbon atoms.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the amount of dialkyl tin diacrylate is from about 0.05 to about 1.0%, based on the total amount of monomer.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the mixture of (b) contains 30-70 parts of methyl methacrylate and 30-70 parts of styrene.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein the mixture of (b) contains up to 10 parts of acrylonitrile.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the polymerization reaction of step (c) is carried out in the presence of a cross-linking agent.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein step (c) is carried out in the presence of an effective amount of a dialkyl tin diacrylate.
Claim 11
Dependent Claim
22 words
The process of claim 9 wherein the alkyl groups of the dialkyl tin diacrylate of step (c) each contains 1-10 carbon atoms.
Claim 12
Dependent Claim
10 words
The graft copolymer prepared by the process of claim 1.
Claim 13
Dependent Claim
40 words
A polymer composition having improved stress whitening properties comprising a major proportion of a vinyl chloride polymer and a minor proportion, sufficient to improve the stress whitening properties of the vinyl chloride polymer, of the graft copolymer of claim 11.
Claim 14
Dependent Claim
31 words
A process for preparing a polymer latex comprising polymerizing butadiene or a mixture of butadiene and styrene in the presence of a small proportion of a dialkyl tin diacrylate cross-linking agent.
Claim 15
Dependent Claim
31 words
A process for preparing a polymer latex comprising polymerizing butadiene or a mixture of butadiene and styrene in the presence of a small proportion of a dialkyl tin diacrylate cross-linking agent.
Claim 16
Dependent Claim
8 words
The product of the process of claim 13.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |