Process of making a high melt viscosity block copolyester

Details Process of making a high melt viscosity block copolyester Process of making a high melt viscosity block copolyester

1985-03-20

1986-06-03

Michl, Paul R.

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

Synthetic resins

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

C08L 6702

Patent

active

045930775

ABSTRACT:
A novel process is disclosed for preparing a high melt viscosity block co-polyester of at least two different linear polyesters. The process comprises melt blending the polyesters and, thereafter, subjecting the melt blended polyesters to a temperature of 10.degree.-50.degree. C. below the melting point of the lowest melting ingredient in the blend until the melt viscosity has increased to at least 10,000 poises at a temperature 10.degree.-15.degree. C. above the melting point of the blend.

REFERENCES:
patent: 3466348 (1969-09-01), Wiener
patent: 3756990 (1973-09-01), Jaeger
patent: 4069278 (1978-01-01), Borman et al.

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