Polyol blends of low Tg and high Tg acrylic copolymers

Details Polyol blends of low Tg and high Tg acrylic copolymers Polyol blends of low Tg and high Tg acrylic copolymers

1990-11-14

1992-03-24

Camish, Marion E.

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

Synthetic resins

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

525125, 525163, 525223, C08F 830, C08L 7500, C08L 3314

Patent

active

050989529

ABSTRACT:
A polyol blend, comprising a low-Tg high-hydroxyl number acrylic copolymer and a high-Tg low-hydroxyl number acrylic copolymer, is disclosed. The low-Tg and high-Tg acrylic copolymers each comprise a hydroxyalkyl acrylate or methacrylate, and a non-hydroxy moiety-containing alkyl methacrylate. The low-Tg copolymer has a hydroxyl number of about 112 to about 187, a number-average molecular weight of about 1500 to about 6000, a polydispersity value of no greater than about 5, and a Tg of about -10.degree. to about 20.degree. C. The high-Tg copolymer has a hydroxyl number of about 35 to about 112, a number-average molecular weight of about 2000 to about 8000, a polydispersity value of no greater than about 5, and a Tg of about 25.degree. to about 100.degree. C. Also disclosed are coating compositions comprising the polyol blend.

REFERENCES:
patent: 4529787 (1985-07-01), Schmidt et al.
patent: 4565730 (1986-01-01), Poth et al.
patent: 4649045 (1987-03-01), Gaske et al.

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