| 摘要 |
Film-forming polymer prepared by polymerisation of: 5 - from more than 0 up to 4 mol% of at least one ethylenically unsaturated monomer unit A selected fro m the carboxylic acid and sulfonic acid derivatives that can yield an acid function upon hydrolysis in water; 10 - from 5 to 45 mol% of at least one monomer unit B selected from the group consisting of the N-vinyl lactam monomers of general formula CH2=CH-N-CO-R'J , the N-vinyl amides of general formula CH2=CH-NR-CO-15 R", the monomers of general formula CH2=CR"'-C00-R"" N- CO-R'I, the monomers of general formula CH2=CR"'C00-R""-NR""'-CO-R", 2- pyrrolidone-l-isoprenyl ketone, and mixtures thereof, wherein - R is H or selected from the group consisting 20 of alkyl, - R' is a n-alkylidene radic al having 2 to 8 carbon atoms, - R" is selected from the group consisting of alkyl, cycloalkyl, aryl, alkylaryl and arylalkyl 25 radicals having a maximu m of 18 carbon atoms, - R"' is H or CH3, - R"" is a n-alkylidene radical havin g from 1 to 8 carbon atoms, - R""' is H or R" 30 and the balance of the monome r units being monomer units C selected from the group consisting of the esters of ethylenically unsaturated carboxylic acids with C1-C18 alcohols, styrene, alpha-methyl styrene, vinyl toluenes, and mixtures thereof.
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