The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 1980
Filed:
Mar. 12, 1979
Nikolai S Enikolopov, Moscow, SU;
Anatoly I Nepomnyaschy, Moscow, SU;
Viktor A Pekarsky, Ljubertsy Moskovskoi oblasti, SU;
Tatyana A Pekarskaya, Moscow, SU;
Mikhail G Brusilovsky, Moscow, SU;
Svetlana A Gavrilina, Moscow, SU;
Naum D Lerman, Yaroslavl, SU;
Oleg K Maimur, Moscow, SU;
Arkady L Iljushin, Kotovsk Tambovskoi oblasti, SU;
Mikhail A Markevich, Moscow, SU;
Susanna M Karpacheva, Moscow, SU;
Lidia P Khorkhorina, Moscow, SU;
Valeryan M Muratov, Moscow, SU;
Semen F Sholk, Moscow, SU;
Other;
Abstract
A process for preparing epoxy resin comprises a step of allowing a mixture of epichlorohydrin, 2,2-bis(p-hydroxyphenyl)propane, and a solvent in the presence of an alkali used in an amount of from 0.4 to 5% by weight of the epichlorohydrin to stay at a temperature of from 45.degree. to 70.degree. C. to obtain a homogeneous mass. Subsequently an alkali used in an amount of from 45 to 50% by weight of the epichlorohydrin is added to the resultant mass, and polycondensation is conducted at a temperature of 70.degree. to 90.degree. C. under stirring to obtain the end product.