US4585818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymethyl methacrylate molding compound
Assignee: Roehm GmbH Darmstadt
•
Filing: 1984-03-19
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Granted: 1986-04-29
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Expires: 2004-03-19
Abstract
Abstract Flame retardant molding compounds comprising polymers of methyl methacrylate having an average molecular weight between 1×10 5 and 2×10 5 , which molding compounds contain from 8 to 15 weight percent of at least one chloroalkylphosphoric acid ester of the formula ##STR1## wherein R 1 is alkyl or ##STR2## and R 2 is hydrogen, methyl, ethyl, or chloro-substituted methyl or ethyl.
Inventors
- 👤 Karl A. Jung
- 👤 Karl-Heinz Jakob
- 👤 Manfred Munzer
- 👤 Wilhelm Wopker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5337
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A flame-retardant molding compound comprising a polymer of methyl methacrylate having an average molecular weight between 1×10 5 and 2×10 5 , from 8 to 15 percent by weight of a first additive which is at least one chloroalkylphosphoric acid ester of the formula ##STR24## wherein R 1 is alkyl having from 1 to 4 carbon atoms or ##STR25## and R 2 is hydrogen, methyl, ethyl, or chloro-substituted methyl or ethyl, and from 0.05 to 2 percent by weight of a second additive which is a sterically hindered phenol or of an ester of trivalent phosphorus, said ester having the formula ##STR26## wherein R 6 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms, P(OR.sub.7).sub.3, wherein R 7 is the same or different alkylphenyl having 14 to 24 carbon atoms, or ##STR27## wherein R 8 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms.
Claim 2
Dependent Claim
154 words
A flame-retardant molding compound comprising a polymer of methyl methacrylate having an average molecular weight between 1×10 5 and 2×10 5 , from 8 to 15 percent by weight of a first additive which is at least one chloroalkylphosphoric acid ester of the formula ##STR24## wherein R 1 is alkyl having from 1 to 4 carbon atoms or ##STR25## and R 2 is hydrogen, methyl, ethyl, or chloro-substituted methyl or ethyl, and from 0.05 to 2 percent by weight of a second additive which is a sterically hindered phenol or of an ester of trivalent phosphorus, said ester having the formula ##STR26## wherein R 6 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms, P(OR.sub.7).sub.3, wherein R 7 is the same or different alkylphenyl having 14 to 24 carbon atoms, or ##STR27## wherein R 8 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms.
Claim 3
Dependent Claim
16 words
A molding compound as in claim 1 wherein said second additive is a sterically hindered phenol.
Claim 4
Dependent Claim
18 words
A molding compound as in claim 1 wherein said second additive is an ester of the formula ##STR28##
Claim 5
Dependent Claim
18 words
A molding compound as in claim 1 wherein said second additive is an ester of the formula P(OR.sub.7).sub.3.
Claim 6
Dependent Claim
18 words
A molding compound as in claim 1 wherein said second additive is an ester of the formula ##STR29##
Claim 7
Dependent Claim
16 words
A flame retardant molding compound as in claim 1 wherein R 2 is methyl or chloromethyl.
Claim 8
Dependent Claim
14 words
A flame retardant molding compound as in claim 1 wherein R 1 is ##STR30##
Claim 9
Dependent Claim
18 words
A flame retardant molding compound as in claim 1 which additionally comprises a compound of the formula ##STR31##
Claim 10
Dependent Claim
53 words
A flame retardant molding compound as in claim 2, wherein said sterically hindered phenol comprises a phenyl group having at least one and not more than two tertiary groups in a position ortho or para to the OH group, the sum of the carbon atoms of all substituents being not less than nine.
Claim 11
Dependent Claim
15 words
A flame retardant formed article produced by extrusion of the molding compound of claim 1.
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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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |