| 摘要 |
<p>A pack contains components A and B wherein component A contains Ai) a solution or dispersion comprising a polymer containing units having hydroxyl groups and Aii) a polymer containing units having carboxyl groups; component B comprises Bi) a polyfunctional crosslinker capable of crosslinking with at least one carboxyl group and at least one hydroxyl group. The components A and B may provide an adhesive, especially for wood substrates. The components A and B may also be used to form protective coatings on wood substrates. Example components Ai) include solutions of polyvinyl alcohol, or dispersions of other polymers such as polyvinylacetate/ethylenevinylacetate in polyvinylalcohol. Suitable components Aii) include carboxylated styrene butadiene rubber latex. The component A may also include filler materials, for example to improve water resistance. The crosslinker may be a polyfunctional aziridine such as one of formula (I), wherein R is a polymer chain and Y is a lower alkyl group of from 1 to 4 carbon atoms.</p> |
