US4053539A
Expired / Lapsed
US
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Process for the preparation of grafted copolymers
Assignee: Creachimie SA
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Filing: 1976-01-30
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Granted: 1977-10-11
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Expires: 1996-01-30
Abstract
Abstract This invention relates to a method of preparing graft polymers by mass polymerizing a mixture of polymerizable vinyl monomers in the presence of an elastomer to which the vinyl monomers are to be grafted, the elastomer being soluble in at least one of the vinyl monomers and also insoluble in at least one of the vinyl monomers, which comprises: A. dissolving an elastomer in at least one monomer in which it is soluble; B. initiating a mass prepolymerization reaction; C.introducing the monomer or monomers in which the elastomer is insoluble during the prepolymerization reaction; D. completing the addition of the monomer or monomers prior to the phase inversion of the reaction medium; and E. completing the polymerization.
Inventors
- 👤 Jacques Delsarte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:45
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
A method of preparing grafted polymers by mass polymerizing a mixture of polymerizable vinyl monomers in the presence of an elastomer on which the vinyl monomers are to be grafted, the elastomer being soluble in at least one of the vinyl monomers and also insoluble in at least one of the vinyl monomers, which comprises: a. dissolving an elastomer in at least one monomer in which it is soluble; b. initiating a mass prepolymerization reaction; c. introducing the monomer or monomers in which the elastomer is insoluble during the prepolymerization reaction; d. completing the addition of the monomer or monomers during the prepolymerization reaction prior to the phase inversion of the reaction medium; and e. completing the polymerization.
Claim 2
Independent Claim
118 words
A method of preparing grafted polymers by mass polymerizing a mixture of polymerizable vinyl monomers in the presence of an elastomer on which the vinyl monomers are to be grafted, the elastomer being soluble in at least one of the vinyl monomers and also insoluble in at least one of the vinyl monomers, which comprises: a. dissolving an elastomer in at least one monomer in which it is soluble; b. initiating a mass prepolymerization reaction; c. introducing the monomer or monomers in which the elastomer is insoluble during the prepolymerization reaction; d. completing the addition of the monomer or monomers during the prepolymerization reaction prior to the phase inversion of the reaction medium; and e. completing the polymerization.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the monomer or monomers in which the elastomer is insoluble are added at a rate which will not cause the elastomer to precipitate.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the elastomer is a mixture of elastomers.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein the mixture of monomers is comprised of at least one vinyl aromatic compound and acrylonitrile or methacrylonitrile, or a derivative thereof, said derivative being selected from methyl acrylate, butylacrylate, 2-ethylhexyl acrylate, lower alkyl methacrylates, acrylamide, methacrylamide, N-butylacrylamide, and mixtures thereof.
Claim 6
Dependent Claim
31 words
The method of claim 4 wherein the mixture of monomers is comprised of about 60 to 80 percent by weight of styrene and 40 to 20 percent by weight of acrylonitrile.
Claim 7
Dependent Claim
36 words
The method of claim 4 wherein the vinyl aromatic compound is selected from α-methylstyrene, o- and p-vinyl toluene, the vinylxylenes, vinylethylbenzene, isopropylstryene, tertbutylstyrene, styrene substituted with one or more chlorine or bromine atoms, and mixtures thereof.
Claim 8
Dependent Claim
19 words
The method of claim 1, step (a), wherein the elastomer is dissolved in about 30 to 100% of styrene.
Claim 9
Dependent Claim
29 words
The method of claim 7 wherein acrylonitrile is present in a quantity of up to about 50% by weight of the quantity necessary to obtain the azeotropic styrene/acrylonitrile composition.
Claim 10
Dependent Claim
14 words
The method of claim 1 by the wherein the elastomer is an EPR elastomer.
Claim 11
Dependent Claim
12 words
The method of claim 1 wherein the elastomer is an EPDM elastomer.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein the elastomer consists of a mixture of elastomers.
Claim 13
Dependent Claim
29 words
The method of claim 1 wherein all of the elastomer being added to form the graft polymer is dissolved in at least one of the monomers in step (a).
Claim 14
Dependent Claim
44 words
The method of claim 1 wherein an aliquot part of the elastomer being added to form the graft polymer is dissolved in at least one of the monomers in step (a) and the remainder of the elastomer is added prior to the phase inversion.
Claim 15
Dependent Claim
25 words
The method of claim 1 wherein an aliquot part of the monomer or monomers in which the elastomer is insoluble is added in step (a).
Claim 16
Dependent Claim
30 words
The method of claim 1 wherein the monomer or monomers in which the elastomer is insoluble are introduced after the mass prepolymerization is initiated and prior to the phase inversion.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |