Patent US4550136A successfully refreshed from Google Patents.
US4550136A
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Method for polymerizing methyl methacrylate
Assignee: Roehm GmbH Darmstadt
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Filing: 1982-09-27
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Granted: 1985-10-29
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Expires: 2002-09-27
Abstract
Abstract A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage by polymerizing methyl methacrylate or a monomer mixture predominantly comprising methyl methacrylate in the presence of a highly sterically hindered amine such as 2,2,6,6-tetramethyl piperidine.
Inventors
- 👤 Ludwig Hosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:26
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14; C08F2/00; C08F2/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR17## wherein R 1 is hydrogen or alkyl having 1 to 4 carbon atoms, R 2 taken alone is hydrogen or alkyl having 1 to 10 carbon atoms, R 3 taken alone is alkyl having 1 to 10 carbon atoms, or R 2 and R 3 taken together with the carbon atom to which they are attached form a 5- or 6-membered heterocycle wherein the hetero atoms are oxygen and/or nitrogen, or such a heterocycle substituted by alkyl and/or oxo.
Claim 2
Independent Claim
151 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR17## wherein R 1 is hydrogen or alkyl having 1 to 4 carbon atoms, R 2 taken alone is hydrogen or alkyl having 1 to 10 carbon atoms, R 3 taken alone is alkyl having 1 to 10 carbon atoms, or R 2 and R 3 taken together with the carbon atom to which they are attached form a 5- or 6-membered heterocycle wherein the hetero atoms are oxygen and/or nitrogen, or such a heterocycle substituted by alkyl and/or oxo.
Claim 3
Independent Claim
122 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR18## wherein R 1 is hydrogen or alkyl having 1 to 4 carbon atoms, R 2 is hydrogen or alkyl having 1 to 10 carbon atoms, and R 5 is --O--CO--Hydrocarbon--CO--O--, wherein Hydrocarbon is alkylene having 2 to 20 carbon atoms or such alkylene substituted by phenyl or by substituted phenyl.
Claim 4
Independent Claim
122 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR18## wherein R 1 is hydrogen or alkyl having 1 to 4 carbon atoms, R 2 is hydrogen or alkyl having 1 to 10 carbon atoms, and R 5 is --O--CO--Hydrocarbon--CO--O--, wherein Hydrocarbon is alkylene having 2 to 20 carbon atoms or such alkylene substituted by phenyl or by substituted phenyl.
Claim 5
Dependent Claim
37 words
A method as in claim 2 wherein R 1 is linear alkyl having 1 to 4 carbon atoms, R 2 is hydrogen, and R 5 is --O--CO--Hydrocarbon--CO--O-- wherein Hydrocarbon is alkylene having 2 to 20 carbon atoms.
Claim 6
Dependent Claim
53 words
A method as in claim 2 wherein said monomer mixture comprises up to 15 percent by weight of an alkyl ester of acrylic acid having 1 to 4 carbon atoms in the alkyl portion and said sterically hindered amine is a di-(2,2,6,6-tetramethylpyridyl)-diester of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms.
Claim 7
Dependent Claim
11 words
A method as in claim 2 wherein said amine is ##STR19##
Claim 8
Dependent Claim
11 words
A method as in claim 2 wherein said amine is ##STR20##
Claim 9
Independent Claim
94 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR21## wherein B is --O--CO--(CH 2 ) y --CO--O--, x is 0 or 1, and y is an integer between 2 and 10.
Claim 10
Independent Claim
94 words
A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage, which method comprises polymerizing methyl methacrylate or a monomer mixture comprising at least 80 percent by weight of methyl methacrylate in the presence of a free radical-forming initiator and in the presence of 0.01 to 1 percent, by weight of the methyl methacrylate or monomer mixture, of a sterically hindered amine of the formula ##STR21## wherein B is --O--CO--(CH 2 ) y --CO--O--, x is 0 or 1, and y is an integer between 2 and 10.
References Cited (Backward Citations)
US3759881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |