US 6,204,334 B1 · Blocky chlorinated polyolefins, process for making and use as impact modifier compatibilizer for PVC or CPVC

Abstract

Blocky chlorinated polyolefins are disclosed as compatibilizers of PVC and/or CPVC resins with polyolefin elastomers. The blocky chlorinated polyolefins facilitate the dispersion of the elastomers as a dispersed phase with the proper size for impact modification of the PVC and/or CPVC. The blocky chlorinated polyolefin provides better adhesion between the elastomer and the PVC and/or CPVC providing better physical properties such as impact strength as measured by Notched Izod and variable height impact testing (VHIT) than did the randomly chlorinated polyolefins, often used as processing aids and as impact modifiers in PVC or CPVC. The differences in properties achieved with blocky chlorinated polyolefins versus randomly chlorinated polyolefins are attributed to the individual blocks of the blocky polyolefin being compatible (and/or co-crystalizable) with either the polyolefin elastomer or the PVC/CPVC resulting in better adhesion between phases. Also disclosed is a process for making optimal blocky chlorinated polyolefins.

Claims21

Dependent claims

A vinyl chloride polymer composition comprising:

a) a polyvinyl chloride resin having at least 70 wt. % repeat units from a vinyl chloride monomer and up to 30 wt. % repeat units from other comonomers;
b) a chlorinated polyethylene having an amorphous phase and a crystalline phase wherein said chlorinated polyethylene contains bound chlorine (% Cl) in an amount of from about 20 to about 50 weight percent based upon the weight of said chlorinated polyethylene, wherein said chlorinated polyethylene has a residual crystallinity equal to or greater than −0.068×(% Cl)2+2.59×(% Cl)+74.71, wherein said % Cl is weight percent bound chlorine in the chlorinated polyethylene, and wherein said chlorinated polyethylene has a melting temperature of from about 110° C. to about 140° C. when measured by differential scanning calorimetry;
and
c) a polyolefin elastomer dispersed in said polyvinyl chloride composition, said elastomer as dispersed having a number average particle diameter of less than 25 μm.

1 more element

A vinyl chloride polymer composition comprising:

a) a chlorinated polyvinyl chloride resin having an inherent viscosity from about 0.5 to about 1.2 and a bond chlorine content from about 59 to about 74 wt. % based upon the weight of the chlorinated polyvinyl chloride resin;
b) a chlorinated polyethylene having an amorphous phase and a crystalline phase wherein said chlorinated polyethylene contains bound chlorine (% Cl) in an amount of from about 20 to about 50 weight percent based upon the weight of said chlorinated polyethylene, wherein said chlorinated polyethylene has a residual crystallinity equal to or greater than −0.068×(% Cl)2+2.59×(% Cl)+74.71, wherein said % Cl is weight percent bound chlorine in the chlorinated polyethylene, and wherein said chlorinated polyethylene has a melting temperature of from about 110° C. to about 140° C. when measured by differential scanning calorimetry;
and
c) a polyolefin elastomer dispersed in said chlorinated polyvinyl chloride composition, said elastomer as dispersed having a number average phase diameter of less than 25 μm.

1 more element

Dependencies are inferred from the claim text.

Blocky chlorinated polyolefins, process for making and use as impact modifier compatibilizer for PVC or CPVC

Life of this patent

Blocky chlorinated polyolefins, process for making and use as impact modifier compatibilizer for PVC or CPVC

Life of this patent

Abstract

Claims21