US4134876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus and linear polyester compositions and products containing them
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1977-01-12
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Granted: 1979-01-16
•
Expires: 1997-01-12
Abstract
Abstract The new compounds are phosphates derived from mono- and di-hydric phenols with blocking groups on at least 75% of the ring carbon atoms adjacent to the carbon atoms attached to the phosphate groups, e.g. phosphates derived from 2,6-dimethyl phenol and 3,3',5,5'-tetramethyl-4,4'-dihydroxybiphenyl.
Inventors
- 👤 Patrick J. Horner
- 👤 Robert B. Rashbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:39
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
Linear polyester compositions which contain as flame retardant sufficient of a hindered phenol phosphate to give a phosphorus content, based on the total composition, between 2% and 0.1% by weight, wherein said hindered phenol phosphate has the average empirical formula: M.sub.2 PO.sub.4 (D-PO.sub.4 (M)).sub.n M where n is an integer from 1 to 10, D is ##STR1## where Y is --C(CH 3 ) 2 --, at least one third of the X groups are blocking groups, said blocking groups being alkyl groups with 1 to 5 carbon atoms and M is ##STR2## and both X groups of M are blocking groups.
Claim 2
Dependent Claim
101 words
Linear polyester compositions which contain as flame retardant sufficient of a hindered phenol phosphate to give a phosphorus content, based on the total composition, between 2% and 0.1% by weight, wherein said hindered phenol phosphate has the average empirical formula: M.sub.2 PO.sub.4 (D-PO.sub.4 (M)).sub.n M where n is an integer from 1 to 10, D is ##STR1## where Y is --C(CH 3 ) 2 --, at least one third of the X groups are blocking groups, said blocking groups being alkyl groups with 1 to 5 carbon atoms and M is ##STR2## and both X groups of M are blocking groups.
Claim 3
Dependent Claim
25 words
Linear polyester composition according to claim 1 wherein M of the hindered phenol phosphate is ##STR3## and both X groups of M are blocking groups.
Claim 4
Dependent Claim
24 words
Linear polyester compositions according to claim 1 in which at least 75% of the X groups of the hindered phenol phosphate are blocking groups.
Claim 5
Dependent Claim
21 words
Linear polyester compositions according to claim 1 in which all the X groups of the hindered phenol phosphate are blocking groups.
Claim 6
Dependent Claim
18 words
Linear polyester compositions according to claim 1 in which the average value of n is 1 to 5.
Claim 7
Dependent Claim
20 words
Linear polyester compositions according to claim 1 in which the blocking groups of the hindered phenol phosphate are methyl groups.
Claim 8
Dependent Claim
14 words
Linear polyester compositions according to claim 1, in which the polyester is poly(ethylene terephthalate).
Claim 9
Dependent Claim
15 words
Mouldings, fibres, textiles and films made of a linear polyester composition according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |