Patent GB-889792-A (GB)
Title: Film-forming dehydrocopolymers
Inventor: HOSKING ALIDA HELENA
IPC: C09D131/00
Filed: 1957-06-03
Abstract: A film-forming dehydrocopolymer is prepared from at least one film-forming compound and at least one compound possessing oxidative drying properties each compound having at least one removable hydrogen atom in the molecule.  Specified compounds possessing oxidative drying properties are esters of drying oil fatty acids with monohydric or polyhydric alcohols, such as the drying oils themselves; drying oil modified resins such as alkyd resins; terpenes, e.g. myrcene and allo-ocimene; and allyl ethers, e.g. glyceryl triallyl ether.  Suitable film-forming compounds are those listed above possessing oxidative drying properties and lacquer type materials such as polystyrene, polyvinyl acetate and polyvinyl chloride.  Compounds having at least one removable hydrogen atom are those which contain one or more active methylene groups or a tertiary carbon atom to which is attached the removable hydrogen atom, and these removable hydrogen atoms are extracted using a dialkyl peroxide, e.g. ditertiary butyl peroxide, 2,2-bistertiarybutoxybutane peroxide and dicumyl peroxide, which is itself converted to an alcohol and is therefore present in a proportion appropriate to that of a reactant and not to that of a catalyst.  The peroxide may also catalyse vinyl polymerization to give a low polymer of a vinyl reactant which may then react with an oil or fatty ester by elimination of hydrogen atoms.  In the Examples the reactants, apart from the peroxide, are (1) soya-bean oil and allo-ocimene, (2) linseed oil and myrcene, (3) soya-bean oil and glyceryl triallyl ether, (4) soya-bean oil and wood rosin, (5) linseed oil and allo-ocimene, (6) methyl esters of linseed oil fatty acids and a low viscosity polyvinyl acetate and (7) methyl esters of linseed oil fatty acids and a styrene-turpentine resin.  The product of (6) is soluble in chloroform and of (7) in xylol.  Driers, e.g. cobalt and lead naphthenates, may be added to the products.ALSO:Film-forming materials are prepared from at least one film-forming compound and at least one compound possessing oxidative drying properties, each compound having at least one removable hydrogen atom, by extracting these removable hydrogen atoms using a dialkyl peroxide, e.g. ditertiary butyl peroxide, 2,2-bistertiarybutoxy-butane peroxide and dicumyl peroxide, the peroxide being converted to an alcohol and being present, therefore, in a proportion appropriate to that of a reactant and not that of a catalyst.  Compounds having at least one removable hydrogen atom are those which contain one or more active methylene groups or a tertiary carbon atom to which is attached the removable hydrogen atom.  Both the film-forming compound and the compound possessing oxidative drying properties may be selected from the group comprising esters of drying oil fatty acids with monohydric or polyhydric alcohols, such as the drying oils themselves; terpenes, e.g. myrcene and allo-ocimene; and ally ethers, e.g. glyceryl triallyl ether.  In some of the examples the reactants are (1) soya-bean oil and allo-ocimene, (2) linseed oil and myrcene, (3) soya-bean oil and glyceryl triallyl ether, (4) soya-bean oil and wood rosin and (5) linseed oil and allo-ocimene.