Patent US4104433A successfully refreshed from Google Patents.
US4104433A
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Flame retardant, non-dripping coating composition comprising crosslinkable copolymers of dihydric phenols with bis chloroalkyl oxetanes
Assignee: 3M Co
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Filing: 1976-01-02
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Granted: 1978-08-01
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Expires: 1996-01-02
Abstract
Abstract Coating compositions for polymeric substrates which reduce or eliminate dripping of the substrates by forming a cohesive, intumescent, adherent char during exposure to flame. The coating compositions comprise halogenated polymers containing oxacyclobutane units, especially the polycondensation product of tetrahalobisphenol and bishaloalkyl oxetane monomers.
Inventors
- 👤 James P. Kirk
- 👤 Robert L. Wear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:49
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4006; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G65/18; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2713; Y10T442/2861
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A char-forming, flame-retardant polymeric composite sheet comprising a flexible polymeric substrate having adhered thereto and substantially coextensive with at least one major surface thereof the char-forming, flame retardant coating of a composition comprising (a) a condensation polymer consisting essentially of repeating units having the formula ##STR4## wherein Ar is a monocyclic or bicyclic aromatic nucleus, X is halogen, y is an integer from 1 to 8, A 1 and A 2 are lower aliphatic radicals containing 1 to 6 carbon atoms, R is independently hydrogen or lower alkyl of 1 to 6 carbon atoms, and n is an integer representing the degree of polymerization and is selected to provide said polymer with an inherent viscosity, determined with a 0.5 weight % solution in 1,1,2,2-tetrachloroethane of at least 0.1, (b) a crosslinking agent for said polymer comprising stannic chloride-acetonitrile complex, and (c) solvent for said polymer.
Claim 2
Dependent Claim
145 words
A char-forming, flame-retardant polymeric composite sheet comprising a flexible polymeric substrate having adhered thereto and substantially coextensive with at least one major surface thereof the char-forming, flame retardant coating of a composition comprising (a) a condensation polymer consisting essentially of repeating units having the formula ##STR4## wherein Ar is a monocyclic or bicyclic aromatic nucleus, X is halogen, y is an integer from 1 to 8, A 1 and A 2 are lower aliphatic radicals containing 1 to 6 carbon atoms, R is independently hydrogen or lower alkyl of 1 to 6 carbon atoms, and n is an integer representing the degree of polymerization and is selected to provide said polymer with an inherent viscosity, determined with a 0.5 weight % solution in 1,1,2,2-tetrachloroethane of at least 0.1, (b) a crosslinking agent for said polymer comprising stannic chloride-acetonitrile complex, and (c) solvent for said polymer.
Claim 3
Dependent Claim
61 words
A composite sheet according to claim 1 wherein said condensation polymer consists essentially of repeating units of the formula ##STR5## wherein x is chlorine or bromine, and n is an integer which represents the degree of polymerization and is selected to provide said copolymer with an inherent viscosity, determined with a 0.5 wt. % solution in 1,1,2,2-tetrachloroethane of at least 0.1.
Claim 4
Dependent Claim
12 words
A composite sheet according to claim 1 wherein said solvent comprises tetrahydrofuran.
Claim 5
Dependent Claim
12 words
A composite sheet according to claim 1 wherein said solvent comprises trichloroethylene.
Claim 6
Dependent Claim
51 words
A char-forming, flame-retardant polymeric composite sheet comprising a flexible polymeric substrate having adhered thereto and substantially coextensive with at least one major surface thereof a char-forming, flame-retardant coating, said coating comprising a crosslinked condensation polymer, said polymer selected from the group consisting of tetrabromobisphenol A: bischloromethyl oxetane and tetrachlorobisphenol A:bischloromethyl oxetane.
Claim 7
Dependent Claim
51 words
A char-forming, flame-retardant polymeric composite sheet comprising a flexible polymeric substrate having adhered thereto and substantially coextensive with at least one major surface thereof a char-forming, flame-retardant coating, said coating comprising a crosslinked condensation polymer, said polymer selected from the group consisting of tetrabromobisphenol A: bischloromethyl oxetane and tetrachlorobisphenol A:bischloromethyl oxetane.
Claim 8
Dependent Claim
15 words
A polymeric sheet according to claim 5 wherein said polymeric substrate is a polyester film.
Claim 9
Dependent Claim
16 words
A polymeric sheet according to claim 6 wherein said polyester film is a flame retardant film.
Claim 10
Dependent Claim
30 words
A polymeric sheet according to claim 7 wherein said flame retardant film is a copolyester of terephthalic acid, ethylene glycol and 3,3-[bis-2,4,6tribromophenoxymethyl] oxetane containing about 10 weight percent of bromine.
Claim 11
Dependent Claim
18 words
A polymeric sheet according to claim 5 wherein said polymeric substrate is a woven or nonwoven fiber web.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |