Low shrinkage unsaturated polyester resin compositions containing graft copolymers

Claim 1

A LOW-SHRINKAGE UNSATURATED POLYESTER RESIN COMPOSITION COMPRISING AN UNSATURATED POLYESTER RESIN CONSISTING OF THE UNCURED MIXTURE OF AN ESSENTIALLY LIANER UNSATURATED POLYESTER OF A POLYCARBOXYLIC DISSOLVED IN A CROSS-LINKING UNSATURATED MONOMER HAVING RADICAL COPOLYMERIZABILITY WITH THE UNSATURATED ALKYD RESIN, AND DISPERSED THEREIN A POWDER OF A POLYOLEFINIC RESIN GRAFT POLYMERIZED WITH AN UNSATURATED MONOMER CAPABLE OF RADICAL POLYMERICATION OR COPOLYMERIZATION AND OF FORMING A POLYMER THAT IS SOLUBLE OR SWELLABLE IN EITHER OR BOTH COMPONENTS OF THE UNSATURATED POLYESTER RESIN. LAPSING THE MOVING TUBE AT AN AREA REMOTE FROM THE POINT OF EXTRUSION, B. INTEGRALLY EXTRUDING WITH THE TUBE, A FIRST THICHENED PROFILE DEFINING A CONTINUOUS GAP THE WIDTH OF WHICH IS SENSITIVE TO HOOP TENSION IN THE TUBE DURING A PERIOD OF ITS MANUFACTURER, AND AT LEAST A SECOND THICKENED PROFILE SPACED CIRCUMFERENTIALLY FROM THE GAP DEFINING PROFILE AND ADAPTED TO BE INTERLOCKINGLY RECEIVABLE IN SAID GAP BY MEANS OF COOPERATIVE SIZING AND CONFIGURATION BETWEEN THE PROFILES, SAID PROFILES EXTENDING CONTINUOUSLY IN THE DIRECTION OF EXTRUSION ALONG THE INNER SURFACE OF THE TUBE, C. CLASPING THE TUBE BETWEEN OPPOSED RACKS OF HEAT CONDUCTIVE ROLLER MEANS FOR A SUBSTANTIAL EXTENT OF THE AREA