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US 4,075,173 AGranted
Process for the production of aromatic polyesters from hydroxybenzoic acid and products thereof
AssigneeSumitomo Chemical Company, Limited
InventorsTakashi Maruyama, Katsuji Ueno
Life of this patent
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Abstract
A process for the production of aromatic polyesters which comprises preparing a prepolymer by subjecting the compounds of the formulae: ##STR1## to heat-polycondensation in the molar ratios of (I) : (II) = 1 : 100 to 100 : 1 and (II) : (III) = 1 : 10 to 10 : 1, pulverizing the prepolymer thus prepared and then heating the resultant in an inert gas or under reduced pressure.
Claims7
A process for producing an aromatic polyester which comprises preparing a prepolymer by subjecting the compounds of the formulae:
- ##STR5## to heat-polycondensation at a temperature of 200.degree.-380.degree. C in the molar ratios of (1) :
- (II) = 1 :
- 100 to 100 :
- 1 and (II) :
- (III) = 1 :
- 10 to 10 :
- 1, pulverizing the prepolymer thus prepared and then heating the resultant in an inert gas or under reduced pressure at a temperature within the range of 200.degree. to less than 380.degree. C while raising the temperature at the rate of 1.degree. to 20.degree. C/hour.
4 more elements
Dependencies are inferred from the claim text.