METHOD OF PREPARING ADDITIVE FOR POLYMER AND BUILDING MATERIALS Russian patent published in 1998 - IPC

FIELD: polymer and building materials. SUBSTANCE: invention relates to additives applicable in production of sulfur concretes, pavements, building parts and structures, and bitumens, in curing rubbers, as plasticizers, antiwelding additives for lube oils, etc. Additive is prepared by interaction of sulfur and unsaturated C₄-C₅₇-carboxylic acid esters. Process is carried out in presence of alkali metal hydroxide taken in quantity 0.5-2.0% based on weight of sulfur. Sulfur to acid weight ratio can make up (80-95):(5-20). Process can also be performed in bitumen melt taken in amount 80-95% of reaction mixture weight, and interaction product can be isolated by means of introducing 1 to 1.5 volumes of an aromatic hydrocarbon per 1 volume of melt. Additive prepared is characterized by low melting temperature (50-70 C), penetration higher than 300, and high frost resistance (up to -30 C). EFFECT: increased workability and improved physico-chemical properties of materials contained additive. 4 cl, 6 tbl