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US 4,536,529 AGranted
Flame retardant thermoplastic compositions
AssigneeGeneral Electric Company
InventorsRobert B. Frye, Michio Zembayashi
Life of this patent
Estimating the term…
Abstract
Flame retardant thermoplastic compositions are described which comprise 30-98% by weight thermoplastic, 1-40% by weight of a silicone fluid, 1-20% by weight of metal soap precursors and 1-20% by weight of a silicone resin. Such compositions offer simpler processing, improved impact resistance and other advantages over conventional flame retardant thermoplastic compositions.
Claims20
A flame retardant composition comprising:
- (A) 30% to 98% by weight of thermoplastic;
- (B) 1% to 40% by weight of a silicone fluid comprised of RR'SiO units, where R and R' represent, independently, substituted or unsubstituted monovalent organic radicals of 1 to 20 carbon atoms, and having a viscosity of about 600 to 300,000,000 cps at 25.degree. C.;
- (C) 1% to 20% by weight of metal soap precursors comprising:
- (i) 50% to 100% by weight of a carboxylic acid or related carboxylic compound containing at least 6 carbon atoms, and
- (ii) 0% to 50% of a reactive Group IIA metal compound,
- (D) 1% to 20% of a silicone resin.
3 more elements
An additive for thermoplastics effective to render said thermoplastics flame retardant, comprising:
- (A) 1 to 40 parts by weight of a silicone fluid comprised of polymeric units of the formula RR'SiO, wherein R and R' represent, independently, substituted or unsubstituted monovalent organic radicals of 1 to 20 carbon atoms, and having a viscosity of about 600 to 300,000,000 cps at 25.degree. C.;
- and
- (B) 1 to 20 parts by weight of metal soap precursors comprising (i) 50% to 100% by weight of a carboxylic acid or related carboxylic compound containing at least 6 carbon atoms, and (ii) 0% to 50% by weight of a reactive Group 11A metal compound;
- (C) 1 to 20 parts by weight of a silicone resin comprised of monofunctional M units of the average formula R.sub.3 SiO.sub.0.5 and tetrafunctional Q units of the average formula SiO.sub.2, and having an average ratio of, approximately, 0.3 to 4.0M units per Q unit.
1 more element
A process for rendering thermoplastics flame retardant comprising the steps:
- Adding to 30% to 90% by weight of thermoplastic
- (a) 1% to 20% by weight of metal soap precursors comprising (i) 50% to 100% by weight of a carboxylic acid containing at least 6 carbon atoms, and (ii) 0% to 50% by weight of a reactive Group IIA metal compound;
- (b) 1% to 20% by weight of a silicone fluid of the formula, XR.sub.2 SiO-(RR'SiO).sub.n -SiR.sub.2 X, wherein R and R' are, independently, substituted or unsubstituted monovalent organic radicals of from 1 to 20 carbon atoms, n is an integer such that said silicone fluid has a viscosity in the range of 600 to 300,000,000 cps at 25.degree. C., and X is a R or a hydroxyl or alkoxyl radical;
- and
- (c) 1% to 20% by weight of a silicone resin comprised of monofunctional M units of the average formula R.sub.3 SiO.sub.0.5 and tetrafunctional Q units of the average ratio of, approximately, 0.3 to 4.0M units per Q unit.
2 more elements
A flame retardant composition comprising:
- (A) 30% to 98% by weight of thermoplastic;
- (B) 1% to 40% by weight of a silicone fluid comprised of RR'SiO units, where R and R' represent, independently, substituted or unsubstituted monovalent organic radicals of 1 to 20 carbon atoms, and having a viscosity of about 600 to 300,000,000 cps at 25.degree. C.;
- (C) 1% to 20% by weight of a metal soap precursor selected from the group consisting of carboxylic acids and related carboxylic acid anhydrides, acid chlorides and esters containing at least 6 carbon atoms;
- and
- (D) 1% to 20% by weight of a silicone resin.
2 more elements
In a flame retardant composition comprising:
- (A) 30% to 98% by weight of thermoplastic;
- (B) 1% to 40% by weight of a silicone fluid comprised of RR'SiO units, where R and R' represent, independently, substituted or unsubstituted monovalent organic radicals of 1 to 20 carbon atoms, and having a viscosity of about 600 to 300,000,000 cps at 25.degree. C.;
- (C) 1% to 20% by weight of a silicone resin;
- and
- (D) a flame-retarding amount of a Group IIA metal soap,
- the improvement wherein said metal soap is partially replaced by a carboxylic acid or related carboxylic compound containing at least 6 carbon atoms, such that said flame retardant composition exhibits improved impact resistance, gloss and processability without a significant reduction is flame retardance.
3 more elements
Dependencies are inferred from the claim text.