Propylene Copolymer Compatibilizers
Propylene copolymers may be compatibilizers for chemically related blends such as polypropylene blends. (RDC 5/10/2011)
Recent US Patents
12/7/2010
7,847,021
Aliphatic polyester resin composition containing copolymer
Shinoda et al of Mitsui Chemicals, Japan, has developed a copolymer having a structure that a propylene-based polyolefin segment (a) and a segment (b) containing a lactic acid as a constituent are bonded in a block state and/or a graft state through a vinyl monomer having a hydroxyl group, wherein a number average molecular weight of the propylene-based polyolefin segment (a) is from 1,000 to 100,000, a number average molecular weight of the segment (b) containing lactic acid as a constituent is from 1,000 to 200,000, and a weight composition of the propylene-based polyolefin segment (a) and the segment (b) containing lactic acid as a constituent is from 10/90 to 90/10. The modified polyolefin resin can be used in a resin composition containing an aliphatic polyester resin (A), a polyolefin resin (B) and the modified polyolefin resin (C). The composition can exhibit excellent heat resistance and impact resistance and can be used for molding various parts.
Recent Journal Articles
PROPYLENE BLOCK COPOLYMER AS A COMPATIBILIZER FOR POST CONSUMER HDPE/PP BLENDS
McConville et al of Queen’s University, United Kingdom
Society of Plastics Engineering Annual Technical Conference, (5/1/2010)
The properties of the PP/HDPE blends in general progressively varied from that of 100% HDPE to 100% PP. Analysis showed some improvements in mechanical performance of the blends with the addition of PP block and random copolymers, but DMTA results suggest no improvement in compatibility.