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US 4,728,674 AGranted
Modified polyphenylene ether resins having improved foamability and methods of making the same
AssigneeGeneral Electric Company
InventorRonald J. Wroczynski
Life of this patent
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Abstract
The production of foamed articles of polyphenylene ether resins is improved by including a modifier comprising an alpha, beta-unsaturated carboxylic acid or derivative. The resulting products are lightweight, exhibit superior heat resistance and retain flame retardancy over polyphenylene ether resins which are foamed in the absence of the modifier. Such resins are especially suited for the production of extrusion and injection foam molding material.
Claims15
A composition comprising the reaction product of:
- (a) a polyphenylene ether resin;
- and
- (b) an effective amount of a functionalizing modifier for (a) comprising:
- (i) a compound of the formula:
- ##STR8## wherein R is selected from alkyl, aryl, alkaryl, haloalkyl, haloaryl or haloalkaryl;
- R.sup.1 is selected independently from hydrogen, alkyl, aryl or alkaryl;
- R.sup.2 is the same as defined for R and, in addition, hydrogen or halogen, the total number of carbon atoms in R, R.sup.1, R.sup.2 being up to about 50;
- x, y and z each being 0 or an integer selected from 1, 2, 3 or 4;
- x.div.y.div.z being equal to 4 and x+z being at least 2;
- (ii) a compound of the formula:
- ##STR9## wherein R.sup.1 and R.sup.2 are as above defined;
- or (iii) a mixture of (i) and (ii);
- and
- (c) an effective foam generating amount of a foaming agent.
11 more elements
Dependencies are inferred from the claim text.