Abstract: An inner-less electrically weldable pipe joint has a hollow cylindrical pipe joint body of a thermoplastic material and a resistance heating wire coil surrounded by the pipe joint body. The wire is partly exposed to an hollow interior of the pipe joint body and partly embedded in an inner surface of the pipe joint body. During the welding operation, the material of the welding zone of the pipe joint and the pipes being connected is readily and selectively heated by the heat from the exposed wire, there by enhancing the welding strength and shortening the welding time. Also, described are methods of producing such an inner-less electrically weldable pipe joint.

Abstract: An electric welding pipe joint made of a thermoplastic resin and containing a heating resistance wire therein may be produced by forming an inner cylindrical thermoplastic resin member by injection molding, winding a heating resistance wire around the inner cylindrical thermoplastic resin member, and forming two or more layers of an outer cylindrical thermoplastic resin member around the resistance wire-wound inner cylindrical member by injection molding successively.

Abstract: The present invention provides a resin composition which is a composition of 30 to 99.5 wt. % of an aromatic polycarbonate and 70 to 0.5 wt. % of a vinylidene fluoride-hexafluoroacetone copolymeric elastomer.This resin composition is excellent in moldability and processability, heat resistance and impact resistance, and useful as an engineering plastic.

Abstract: A synthetic resin compatibilizer comprising a copolymer of a polyoxyalkylene derivative represented by general formula(I) with maleic anhydride, maleic acid, or a salt or an ester thereof ##STR1## where B represents a residue of a compound having from 2 to 8 hydroxyl groups; AO represents an oxyalkylene group having from 2 to 18 carbon atoms; R.sup.1 represents an unsaturated hydrocarbon group having from 2 to 5 carbon atoms; R.sup.2 represents a hydrocarbon or acyl group having from 1 to 40 carbon atoms; a is from 0 to 1,000; b is from 0 to 1,000; c is from 0 to 1,000; l is from 1 to 8; m is from 0 to 2; and n is from 0 to 7; l+m+n=2 to 8; al+bm+cn=1 to 1,000, and m/(l+n).ltoreq.1/3.The synthetic resin compatibilizer provides a polymer alloy having excellent tensile and flexural strengths.

Abstract: A fluororesin composition useful as a pressure sensitive adhesive is obtained by blending 2-50 wt % of a copolymer of vinylidene fluoride and hexafluoroacetone with a copolymer of 2-ethylhexyl acrylate and at least one other vinylic monomer. As the latter copolymer, either a copolymer made up of at least 60 mol % of 2-ethylhexyl acrylate and the balance of methacrylic ester(s) or a copolymer of 50-95 mol % of 2-ethylhexyl acrylate, 5-40 mol % of vinyl acetate and 0-40 mol % of additional vinylic comonomer(s) selected from acrylic acid and its esters and methacrylic acid and its esters is suitable. This resin composition is sufficiently strong in both tack adhesion power and cohesive force and has excellent weatherability, water resistance and oil resistance.