Readily extruded chlorinated copolymers and process of preparing same

Abstract

Abstract POSTCHLORINATED COPOLYMERS OF VINYL CHLORIDE AND 210% BY WEIGHT OF EITHER ISOBUTYLENE OR A VINYL ETHER HAVE THE ADVANTAGEOUS COMBINATION OF READY EXTRUDABILITY AT 190*C. AND A VICAT TEMPERATURE OF AT LEST 100*C. THE MOLECULAR WEIGHT OF THE RESIN SELECTED AS THE STARTING MATERIAL SHOULD BE GREATER THAN ABOUT 10,000, AND LESS THAN ABOUT 50,000, SUCH RANGE BEING ALSO EXPRESSED BY VALUES OF FROM ABOUT 150 TO ABOUT 750 FOR THE TOTAL NUMBER OF C2 GROUPS IN THE POLYMER. THE STARTING MATERIAL CAN BE REPRESENTED BY: (CHCICH2)M(CQYCH2)N IN WHICH M+N=P, IN WHICH N/P IS IN A RANGE PERMITTING 2-10% BY WEIGHT OF THE COMONOMER. Y IS METHYL OR HYDROGEN; Q IS METHYL IF Y IS METHYL; Q IS OR IS Y IS HYDROGEN, THE R BEING AN ALKYL GROUP HAVING LESS THAN 20 CARBON ATOMS, ANY CHLORINE SUBSTITUENTS ON THE R OR METHYL GROUPS NOT IMPARING THE R OR METHYL TERMINOLOGY. THE PRODUCTS CAN BE REPRESENTED AS: (CCI2CH2)Q(CHCICHCI)R(CHCICH2)8 (CQYCH2)T(CQYCHCI)U IN WHICH Q+R+S+T+U=V AND V IS ABOUT EQUAL TO P AND WITHIN THE 150-750 RANGE. THE DEGREE OF SUBSTITUTION IS 0.3-0.8 SO THAT S IS (0.7-0.2) M AND T IS USUALLY MORE THAN (0.7-0.2)N. THE COMBINATION OF READY MOLABILITY AT 190*C. AND A VICAT TEMPERATURE OF AT LEAST 100*C. IS ATTRIBUTED TO THE RELATIVELY LARGE RATIO OF R/Q, POSSIBLY RESULTING FROM THE DIRECTIVE INFLUENCE OF CQYCH2 UPON THE CHLORINATION OF CHCICH2, THE BULKINESS OF THE Q AND Y TENDING TO PROMOTE FORMATION OF HIGHER THAN RANDOM PROPORTIONS OF CHCICHCI GROUPS DURING THE POSTCHLORINATION.

Inventors

• 👤 John H Beale
• 👤 William Mayo Smith Jr

Bibliographic Details