Compositions comprising visco-elastic liquid compounds
AssigneeInterox Chemicals Limited
InventorCharles F. Cardy
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Abstract
Polyfunctional viscoelastic liquid compounds having molecular weights of at least 25,000 and preferably from 40,000 to 10 million comprise vinyl polymers having adducted thereon a plurality of groups, the same or different, the adducted groups having the general formula --CO--(CR.sub.2).sub.z --0--.sub.n H wherein R represents a low molecular weight organic radical or, preferably, hydrogen, the total number of carbon atoms in all occurrences of R not exceeding 12, z represents a whole number from 4 to 8, preferably 5, and n represents on average, a number from, preferably, 0.5 to 300 per vinyl unit of the vinyl polymer. The compounds are soluble in a wide range of organic solvents and can find applications in adhesives, tackifiers, and fillers such as mastics, putties and like compositions.
Claims17
A composition comprising a polyfunctional viscoelastic liquid compound having a molecular weight of at least 25,000 and comprising a polyvinyl alcohol polymer in which at least half of the vinyl units of the vinyl polymer have adducted thereon a plurality of functional groups having the general formula --CO--(CR.sub.2).sub.z --O--.sub.n H wherein R, in each occurrence in the formula, represents either a hydrogen atom or an organic radical, the total number of carbon atoms in all the occurrences of R not exceeding 12, z represents a whole number having a value of from 4 to 8 and n represents a whole number having an average value of at least 0.5 per vinyl unit of the polyvinyl alcohol polymer.
A process for the production of a polyfunctional viscoelastic liquid compound having a molecular weight of at least 25,000 and comprising a polyvinyl alcohol polymer in which at least half of the vinyl units of the polyvinyl alcohol polymer have adducted thereon a plurality of functional groups having the general formula --CO--(CR.sub.2).sub.z --O--.sub.n H wherein R, in each occurrence in the formula, represents either a hydrogen atom or an organic radical, the total number of carbon atoms in all the occurrences of R not exceeding 12, z represents a whole number having a value of from 4 to 8 and n represents a whole number having an average value of at least 0.5 per vinyl unit of the polyvinyl alcohol polymer, said process comprising forming a polymerisation mixture of polyvinyl alcohol a lactone having the formula ##STR4## wherein R and z have the values above ascribed to them, and a catalyst, and heating the mixture to cause the polymerisation reaction to proceed, wherein the polyvinyl alcohol polymer and the lactone have been treated to remove volatile materials therefrom before the catalyst containing reaction mixture is formed and the quantity of lactone is such that the molecular weight of the resulting polymer would be at least 25,000.
Dependencies are inferred from the claim text.