Chlorinated vinyl resin/cellulosic blends: composition, processes, composites, and articles therefrom

An extrudable free-flowing powder blend composition comprising:

• (a) from 40 to 55 weight percent of at least one PVC resin;
• (b) from 0.5 to 1.5 weight percent of at least one thermal stabilizer;
• (c) from 1.5 to 3 weight percent of at least one lubricant;
• (d) from 5 to 10 weight percent of at least one high molecular weight polymer processing aid;
• (e) from 34 to 52 weight percent of at least one wood flour;
• (f) from 3 to 15 weight percent of at least one mineral filler;
• and
• (g) up to 3 weight percent of at least one blowing agent, based upon the total weight of the powder blend.

A composite comprising a substrate layer comprising an extrudable thermoplastic resin, and at least one capstock layer disposed thereon, the at least one capstock layer comprising an extrudable free-flowing powder blend composition comprising:

• (a) from 40 to 55 weight percent of at least one PVC resin;
• (b) from 0.5 to 1.5 weight percent of at least one thermal stabilizer;
• (c) from 1.5 to 3 weight percent of at least one lubricant;
• (d) from 5 to 10 weight percent of at least one high molecular weight polymer processing aid;
• (e) from 34 to 52 weight percent of at least one wood flour;
• (f) from 3 to 15 weight percent of at least one mineral filler;
• and
• (g) up to 3 weight percent of at least one blowing agent, based upon the total weight of the powder blend.