Process of making a high melt viscosity block co-polyester

Details Process of making a high melt viscosity block co-polyester Process of making a high melt viscosity block co-polyester

1975-04-01

1978-01-17

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 75T, C08L 6702

Patent

active

040692787

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: 2836576 (1958-05-01), Piccard
patent: 3446778 (1969-05-01), Waller
patent: 3466348 (1969-09-01), Wiener
patent: 3567799 (1971-03-01), Prevorsek
patent: 3629366 (1971-12-01), Brinkman
patent: 3651172 (1972-03-01), Barkey
patent: 3728309 (1973-04-01), Maxion
patent: 3756990 (1973-09-01), Jaeger
patent: 3804811 (1974-04-01), Rose

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