FIELD: polymer materials.
SUBSTANCE: invention relates to a method of producing plasticized polyvinylbutyrals, to use thereof for molding, in particular when manufacturing films employed as interlayer in laminated protective spectacles. Plasticized polyvinylbutyral contains, as plasticizer, at least one alkylene benzoate and/or polyalkylene glycol benzoate mixed with at least one further plasticizer from group consisting of aliphatic diol esters or (poly)alkylene glycol esters or, respectively, esters of (poly)alkylenepolyols with aliphatic carboxylic acids and diesters of aliphatic or aromatic dibasic C2-C18-carboxylic acids with aliphatic C4-C12-alcohols. Described are also a method for production of above-defined polyvinylbutyral, utilization of polyvinylbutyral to produce compositions for molding and to obtain films, as well as a film containing indicated polyvinylbutyral. Films thus obtained show adhesive strength at a level of 8.5 in Pummel F scale, opacity 0.06, color variation factor 0.3, melt flow rate MFR 190 at a level of 3.55 g/10 min.
EFFECT: improved characteristics of films.
11 cl, 3 dwg, 5 tbl, 7 ex
