Flame retardant aromatic polycarbonate compositions made from fluorinated diphenols
AssigneeGeneral Electric Company
InventorsVictor Mark, Charles V. Hedges
Life of this patent
Estimating the term…
Abstract
Improved flame retardance is imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate fluorinated diphenols and incorporating them in homopolymers or copolymers. The fluorinated diphenols have at least one fluorinated alkyl or fluorinated aryl group upon the methylene carbon atom positioned between the two phenol ring structures. The polycarbonates having improved flame retardance are made from fluorinated diphenols and halogen-containing carbonate precursors. Copolycarbonates having improved flame retardance are derived from the fluorinated diphenols and non-fluorinated diphenols. The flame retardant polycarbonates may be used in films and molded articles where improved resistance to flame is desirable.
Claims28
A high-molecular weight aromatic polycarbonate having improved flame-retardance, said polycarbonate having the general formula:
- ##STR7## wherein n is an integer from 5 to 1,000;
- R is a radical selected from the group consisting of a fluorinated alkyl radical having from three to about twenty-two carbon atoms and a fluorinated aryl radical;
- R' is selected from the group consisting of fluorinated alkyl radical, fluorinated aryl radical, alkyl radical and hydrogen;
- and Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 are each independently selected from the group consisting of hydrogen, alkyl radical, chlorine and bromine.
A high-molecular weight copolycarbonate composition of matter having improved flame retardance comprising units derived from:
- (a) a fluorinated bisphenol having the general formula:
- ##STR8## (b) a non-fluorinated bisphenol having the general formula:
- ##STR9## wherein R is a radical selected from the group consisting of a fluorinated alkyl radical and a fluorinated aryl radical;
- R' is selected from the group consisting of fluorinated alkyl radical, fluorinated aryl radical, alkyl radical and hydrogen;
- Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 are each independently selected from the group consisting of hydrogen, alkyl radical, chlorine and bromine;
- and W is selected from the group consisting of C.sub.1 -C.sub.9 alkylene, C.sub.2 -C.sub.9 alkylidene, C.sub.5 -C.sub.15 cycloalkylene, C.sub.5 -C.sub.15 cycloalkylidene, a single bond, --O--, --S--, --SO--, --SO.sub.2 -- and --CO-- and
- (c) a carbonate precursor.
A composition comprising a blend of
- a. the high molecular weight aromatic polycarbonate having improved flame retardance, said polycarbonate having the general formula:
- ##STR11## wherein n is an integer from 5 to 1,000;
- R is an radical selected from the group consisting of a fluorinated alkyl radical and a fluorinated aryl radical;
- R.sup.1 is selected from the group consisting of fluorinated alkyl radical, fluorinated aryl radical, alkyl radical and hydrogen;
- and Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 are each independently selected from the group consisting of hydrogen, alkyl radical, chlorine and bromine;
- and
- b. a polymer selected from the group consisting of a polyester or non-fluorinated aromatic polycarbonate, said aromatic polycarbonate selected from the group consisting of linear aromatic polycarbonates, branched polycarbonates, and linear and branched aromatic polycarbonates.
Dependencies are inferred from the claim text.