US4174432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant rigid thermoplastic foams
Assignee: General Electric Co
•
Filing: 1979-02-08
•
Granted: 1979-11-13
•
Expires: 1999-02-08
Abstract
Abstract Shaped flame retardant rigid thermoplastic foams are provided having high impact strength and superior smoke density and superior radiant panel test values. Blends of dichloroethylene bisphenol polycarbonate and a high performance thermoplastic polymer, such as isopropylidene bisphenol polycarbonate are injection foam molded under melt conditions to a variety of shaped structures.
Inventors
- 👤 George E. Niznik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2369/00; C08J2469/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
Shaped flame retardant rigid thermoplastic foams having a density of 0.5 g/cc to 1.2 g/cc, and a Gardner Impact Strength of at least 10 ft-lbs, which is the product obtained by injection foam molding the melt of a blend comprising by weight (A) from 5-100% of a thermoplastic haloethylene polycarbonate having an intrinsic viscosity of at least 35 dl/g and consisting essentially of chemically combined units of the formula, ##STR7## and correspondingly (B) from 0-95% of a thermoplastic polycarbonate, where R and R 1 are divalent aromatic radicals having from 6-13 carbon atoms, X is a halogen atom and X 1 is selected from X and hydrogen.
Claim 2
Dependent Claim
107 words
Shaped flame retardant rigid thermoplastic foams having a density of 0.5 g/cc to 1.2 g/cc, and a Gardner Impact Strength of at least 10 ft-lbs, which is the product obtained by injection foam molding the melt of a blend comprising by weight (A) from 5-100% of a thermoplastic haloethylene polycarbonate having an intrinsic viscosity of at least 35 dl/g and consisting essentially of chemically combined units of the formula, ##STR7## and correspondingly (B) from 0-95% of a thermoplastic polycarbonate, where R and R 1 are divalent aromatic radicals having from 6-13 carbon atoms, X is a halogen atom and X 1 is selected from X and hydrogen.
Claim 3
Dependent Claim
18 words
An article in accordance with claim 1, where the polycarbonate of (A) consists essentially of dichloroethylene bisphenol units.
Claim 4
Dependent Claim
18 words
An article in accordance with claim 1, where the polycarbonate consists essentially of chemically combined isopropylidine bisphenol units.
Claim 5
Dependent Claim
16 words
An article in accordance with claim 1 having up to 60% by weight of glass fiber.
Claim 6
Dependent Claim
16 words
An article in accordance with claim 1, comprising up to 100% by weight of haloethylene polycarbonate.
Claim 7
Dependent Claim
164 words
Shaped flame retardant rigid thermoplastic foams having a density of from 0.5 g/cc to 1.2 g/cc and a Gardner Impact Strength of at least 10 ft-lbs, which is the product obtained by the injection foam molding of the melt of a thermoplastic copolymer consisting essentially of at least 5 mole percent of haloethylene units of the formula, ##STR8## chemically combined with up to 95 mole percent of bisphenol units of the formula, ##STR9## where R and R 1 are divalent aromatic radicals having from 6-13 carbon atoms, X is a halogen atom, X 1 is selected from the class consisting of X and hydrogen and Z is selected from the class consisting of R 2 and R 2--Q--R 2 , R 2 is selected from R radicals and Q is selected from the class consisting of, ##STR10## divalent cycloaliphatic radicals, oxyaryleneoxy radicals, sulfonyl, sulfinyl, oxy, thio, fluoroenyl, phenolphthalein and R 3 is selected from the class consisting of C.sub.(1-8) alkyl, R and halogenated derivatives.
Claim 8
Dependent Claim
164 words
Shaped flame retardant rigid thermoplastic foams having a density of from 0.5 g/cc to 1.2 g/cc and a Gardner Impact Strength of at least 10 ft-lbs, which is the product obtained by the injection foam molding of the melt of a thermoplastic copolymer consisting essentially of at least 5 mole percent of haloethylene units of the formula, ##STR8## chemically combined with up to 95 mole percent of bisphenol units of the formula, ##STR9## where R and R 1 are divalent aromatic radicals having from 6-13 carbon atoms, X is a halogen atom, X 1 is selected from the class consisting of X and hydrogen and Z is selected from the class consisting of R 2 and R 2--Q--R 2 , R 2 is selected from R radicals and Q is selected from the class consisting of, ##STR10## divalent cycloaliphatic radicals, oxyaryleneoxy radicals, sulfonyl, sulfinyl, oxy, thio, fluoroenyl, phenolphthalein and R 3 is selected from the class consisting of C.sub.(1-8) alkyl, R and halogenated derivatives.
Claim 9
Dependent Claim
22 words
An article in accordance with claim 1, where the copolymer consists essentially of chemically combined bisphenol dihaloethylene units and bisphenol isopropylidene units.
Claim 10
Dependent Claim
16 words
An article in accordance with claim 6, having up to 50% by weight of glass fiber.
References Cited (Backward Citations)
US3779954A
Cited
US3781233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |