GB1321604A - Bonding a substrate to polymeric material - Google Patents

Abstract

1321604 Coatings DUNLOP HOLDINGS Ltd 1 July 1970 [4 July 1969] 33818/69 Addition to 1255777 Heading B2E A method of bonding a substrate to a polymeric material comprises contacting the substrate with the polymeric material in the presence of (a) a polyhydroxy compound having the general formula: in which R 1 to R 14 are hydrogen atoms, hydroxyl, alkyl, allyl, aryl, or aralkyl groups, at least one of R 1 to R 5 and at least one of R 6 to R 10 being a hydroxyl group, and at least one ortho- or para-position in each ring relative to a hydroxyl group being occupied by a hydrogen atom and (b) a compound capable of reacting with a polyhydroxy compound to form a formaldehyde condensation resin and heating the resulting assembly to cause the resin-forming compounds to react. Numerous suitable polyhydroxy compounds are specified such as 2, 2-bis (4-hydroxyphenyl) propane, 4, 4'-dihydroxy-tetraphenyl methane and sym-bis (4-hydroxyphenyl) ethane. Suitable polymeric materials are polyvinyl chloride, polyvinyl acetate, vinyl chloride/vinyl acetate copolymer, ethylene/vinyl acetate copolymer, ethylene/ ethyl acrylate copolymer, polyethylene, ethylene/polypropylene copolymer, polyurethanes and ionomers such as ethylene/sodium methacrylate copolymer. Polymeric material may also be based on a block copolymer, such as an elastomeric block copolymer of general formula A-(B-A) n in which A represents a non-elastomeric block having a second-order transition temperature greater than 25‹C. and a number average molecular weight of 200-2,000 and B is an elastomeric polymer block of glass-transition temperature of less than 10‹C. and a number average molecular weight of 25,000-1,000,000 and n is an integer of from 1 to 10. An exemplified material consists of a polyvinyl chloride/nitrile rubber blend. The resin may be formed by reaction of a methylene donating compound such as hexamethoxymethyl melamine, ethyloxymethyl pyridinium chloride and trioxan hexamethylol melamine. The preferred formaldehyde-generator is formaldehyde. The formaldehydegenerator may be in the form of microencapsulated particles. Numerous suitable sheathing materials are listed such as ethyl cellulose, polypropylene, ethylene propylene copolymer, cyolized natural rubber and polycarbonate. Fillers such as silica, pigments and other articles may be present. The substrate may be of metal, glass or a textile material such as polypropylene, polyamide or polyester fibres.