US4369296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of methyl methacrylate homo- or co-polymers
Assignee: Bayer AG
•
Filing: 1981-03-16
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Granted: 1983-01-18
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Expires: 2001-03-16
Abstract
Abstract A process for the polymerization of methyl methacrylate or mixtures thereof with up to 25%, by weight, based on total monomer, of vinyl monomers copolymerizable therewith, wherein polymerization is carried out in the presence of from 0.01 to 10%, by weight, based on total monomer, of one or more enol ethers derived from aliphatic or cycloaliphatic aldehydes or ketones.
Inventors
- 👤 Wolfgang Podszun
- 👤 Carlhans Suling
- 👤 Heinrich Alberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A process for the polymerisation of methyl methacrylate or mixtures thereof with up to 25%, by weight, based on total monomer, of vinyl monomers copolymerisable therewith, wherein polymerisation is carried out in the presence of from 0.01 to 10%, by weight, based on total monomer, of at least one enol ether derived from an aliphatic or cycloaliphatic aldehyde or ketone.
Claim 2
Dependent Claim
60 words
A process for the polymerisation of methyl methacrylate or mixtures thereof with up to 25%, by weight, based on total monomer, of vinyl monomers copolymerisable therewith, wherein polymerisation is carried out in the presence of from 0.01 to 10%, by weight, based on total monomer, of at least one enol ether derived from an aliphatic or cycloaliphatic aldehyde or ketone.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1, wherein from 0.05 to 1%, by weight, based on total monomer, of said enol ether is used.
Claim 4
Dependent Claim
66 words
A process as claimed in claim 1 or 2, wherein said enol ether is selected from the group consisting of ##STR22## wherein R 1 and R 2 , which may be the same or different, represent hydrogen or a C 1 -C 5 alkyl radical; and R represents a C 1 -C 20 alkyl, C 5 -C 10 cycloalkyl or C 7 -C 20 aralkyl radical.
Claim 5
Dependent Claim
42 words
A process as claimed in claim 1 or 2, wherein said enol ether is of the formula ##STR23## wherein R 1 represents H or CH 3 ; and R represents C 1 -C 10 alkyl, C 5 -C 10 cycloalkyl or benzyl.
Claim 6
Dependent Claim
48 words
A process as claimed in claim 1 or 2, wherein C 2 -C 20 alkyl esters of methacrylic acid, C 1 -C 20 alkyl esters of acrylic acid, styrene, C 1 -C 4 alkyl substituted styrenes, acrylonitrile, methacrylonitrile or mixtures thereof are used as the copolymerisable vinyl monomers.
Claim 7
Dependent Claim
35 words
A process as claimed in claim 5, wherein C 2 -C 15 alkyl esters of methacrylic acid, C 1 -C 8 alkyl esters of acrylic acid or mixtures thereof are used as the vinyl monomers.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 or 2, wherein polymerisation is carried out in emulsion or suspension.
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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |