US3943190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing acrylate polymers
Assignee: Asahi Kasei Corp
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Filing: 1974-07-30
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Granted: 1976-03-09
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Expires: 1994-07-30
Abstract
Abstract A process for preparing arcylate polymers comprising subjecting to suspension-polymerization a system (I) comprising an alkyl ester of methacrylic acid, said system (I) optionally containing an alkyl ester of acrylic acid and other vinyl monomer copolymerizable with said esters, to obtain a suspension containing polymer beads; and adding to the resulting suspension an aqueous suspension of a system (II) comprising an alkyl ester of acrylic acid and a cross-linking monomer, said system (II) optionally containing an alkyl ester of methacrylic acid and being employed in an amount of 20 to 70 parts by weight per 100 parts by weight of said system (I), under agitation at a temperature allowing substantial advance of polymerization to effect a final polymerization. The polymers obtained by the process are excellent in both the weather resistance and impact resistance, which are suitable for formation of molded products having excellent properties, especially, suitable for formation of films having a beautiful lustrous surface and excellent mechanical properties.
Inventors
- 👤 Takeaki Abe
- 👤 Masaharu Horikawa
- 👤 Jiro Kurita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:55
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
A process for preparing acrylate polymers which comprises suspension-polymerizing a system (I) comprising 60 to 100% by weight based on the system (I) of an alkyl ester of methacrylic acid, 0 to 40% by weight based on the system (I) of an alkyl ester of acrylic acid and 0 to 10% by weight based on the system (I) of other vinyl monomers copolymerizable with said esters to obtain a suspension containing polymer beads; and adding to the resulting suspension an aqueous suspension of a system (II) comprising 89 to 99.9% by weight based on the system (II) of an alkyl ester of acrylic acid, 0.1 to 3% by weight based on the system (II) of a cross-linking monomer and 0 to 10% by weight based on system (II) of an alkyl ester of methacrylic acid, said system (II) being employed in an amount of 20 to 70 parts by weight per 100 parts by weight of said system (I), under agitation at a temperature allowing substantial advance of polymerization and thereafter effecting complete polymerization.
Claim 2
Dependent Claim
174 words
A process for preparing acrylate polymers which comprises suspension-polymerizing a system (I) comprising 60 to 100% by weight based on the system (I) of an alkyl ester of methacrylic acid, 0 to 40% by weight based on the system (I) of an alkyl ester of acrylic acid and 0 to 10% by weight based on the system (I) of other vinyl monomers copolymerizable with said esters to obtain a suspension containing polymer beads; and adding to the resulting suspension an aqueous suspension of a system (II) comprising 89 to 99.9% by weight based on the system (II) of an alkyl ester of acrylic acid, 0.1 to 3% by weight based on the system (II) of a cross-linking monomer and 0 to 10% by weight based on system (II) of an alkyl ester of methacrylic acid, said system (II) being employed in an amount of 20 to 70 parts by weight per 100 parts by weight of said system (I), under agitation at a temperature allowing substantial advance of polymerization and thereafter effecting complete polymerization.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the alkyl ester of methacrylic acid is one having 1 to 4 carbon atoms in the alkyl moiety.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein the alkyl ester of methacrylic acid is methyl methacrylate.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein the alkyl ester of acrylic acid is one having 1 to 8 carbon atoms in the alkyl moiety.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the alkyl ester of acrylic acid is ethyl acrylate or n-butyl acrylate.
Claim 7
Dependent Claim
36 words
A process according to claim 1 wherein said other vinyl monomer is a member selected from the group consisting of an aromatic vinyl compound, a vinyl ester of an aromatic or aliphatic carboxylic acid and acrylonitrile.
Claim 8
Dependent Claim
35 words
A process according to claim 1 wherein the cross-linking monomer is a member selected from the group consisting of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, diallyl phthalate, divinylbenzene, ethylene glycol diacrylate and ethylene glycol dimethacrylate.
Claim 9
Dependent Claim
23 words
A process according to claim 1 wherein the suspension-polymerization of the system (I) is conducted at a temperature of 60° to 95° C.
Claim 10
Dependent Claim
20 words
A process according to claim 1 wherein the final polymerization is conducted at a temperature of 60° to 95° C.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein the suspension-polymerization of system (I) is carried out substantially to completion.
References Cited (Backward Citations)
US3745196A
Cited
US3833686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |