Process for making polyvinyl chloride compositions having high h

Details Process for making polyvinyl chloride compositions having high h Process for making polyvinyl chloride compositions having high h

1994-04-12

1996-03-26

Thibodeau, Paul J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525203, 525205, 525207, 525208, 525227, 525238, 525240, 525241, C08L 2706, C08L 2708

Patent

active

055021115

ABSTRACT:
Heat distortion temperature of polyvinyl chloride compositions can be significantly increased above the heat distortion temperature of uncompounded polyvinyl chloride while good appearance of extruded material is preserved by preblending an imidized acrylic resin having a glass transition temperature above 130.degree. C. with a third polymer melt-processable throughout the temperature range of 150.degree.-300.degree. C. under conditions where a two-phase blend is formed, wherein the third polymer forms the continuous phase and the imidized acrylic resin forms the dispersed phase and then melt-blending the two-phase blend with polyvinyl chloride at a temperature of 150.degree.-220.degree. C. to form a composition in which the imidized acrylic resin forms a substantially homogeneous blend with polyvinyl chloride. It also is possible to preblend imidized acrylic resin with a third polymer with which it is compatible, for example, another imidized acrylic resin having a sufficiently low glass transition temperature to lower the resulting glass transition temperature of the preblend below about 130.degree. C., which then is blended with polyvinyl chloride.

REFERENCES:
patent: 3629170 (1971-12-01), Yamanouchi
patent: 4246374 (1981-01-01), Kopchik
patent: 4255322 (1981-03-01), Kopchik
patent: 4595727 (1986-06-01), Doak
patent: 4613533 (1986-09-01), Loomis et al.
patent: 4650824 (1987-03-01), Clikeman et al.
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patent: 5004777 (1991-04-01), Hallden-Abberton et al.
Paraloid.RTM. HT-510.TM. "Heat Distortion Temperature Modifier for Clear and Opaque PVC" Rohm & Haas Jan. 1988.
Paraloid.RTM. EXL.TM. "EXL.TM.-4000 Additives" Rohm & Haas Jun. 1990.

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