초록 ▼

A solution of a polyurethane in a polyol is made from (a) the reaction product of a polyisocyanate and a diprimary diol, and (b) a polyether in which the reaction product constitutes from 3 to 60 wt. % of the solution. Suitable diprimary diols have a molecular weight of from 90 to 800 and a structur

A solution of a polyurethane in a polyol is made from (a) the reaction product of a polyisocyanate and a diprimary diol, and (b) a polyether in which the reaction product constitutes from 3 to 60 wt. % of the solution. Suitable diprimary diols have a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the general formula: [Figure] in which R1 represents chlorine, an alkyl, cycloalkyl, aralkyl or aryl radical having from 1 to 10 carbon atoms, which carbon atoms may be substituted or interrupted by chlorine, ester groups, ether groups, amide groups, urethane groups or nitrile groups, and R2 represents hydrogen or a radical within the definition of R1. Polyethers which may be employed have at least two hydroxyl groups (at least 80% of which are secondary hydroxyl groups) and an average molecular weight of from 500 to 12,000. The disclosed solutions are particularly useful in the production of flexible polyurethane plastics which are suitable for flamecoating and high frequency bonding.

대표청구항 ▼

A solution of a polyurethane in a polyol comprising: (a) the reaction product of a polyisocyanate with a diprimary diol, said diprimary diol having a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the general formula: [Figure] in which R1 represents chlor

A solution of a polyurethane in a polyol comprising: (a) the reaction product of a polyisocyanate with a diprimary diol, said diprimary diol having a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the general formula: [Figure] in which R1 represents chlorine or an alkyl, cycloalkyl, aralkyl or aryl radical having from 1 to 10 carbon atoms, which radical may be substituted or interrupted by chlorine, ester groups, ether groups, amide groups, urethane groups or nitrile groups, and R2 represents hydrogen or a radical within the definition of R1; and (b) a polyether with an average molecular weight of from 500 to 12,000 having at least two hydroxyl groups, in which at least 80% of the hydroxyl groups are secondary; with the reaction product (a) comprising from 3 to 60 wt. % of the solution. A process for the production of polyurethane flexible foamed plastics comprising reacting polyisocyanates with high molecular weight compounds having at least two hydroxyl groups and water, characterized in that the higher molecular weight compound having at least two hydroxyl groups is a solution comprising: (a) the reaction product of a polyisocyanate and a diprimary diol, said diol having a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the formula: [Figure] wherein R1 represents chlorine, an alkyl, cycloalkyl, aralkyl or aryl radical having from 1 to 10 carbon atoms, which carbon atoms may be substituted or interrupted by chlorine, ester groups, ether groups, amide groups, urethane groups, nitrile groups or a combination of such groups, and R2 represents hydrogen or a radical within the definition of R1; and (b) a polyether with an average molecular weight of from 500 to 12,000, said polyether having at least two hydroxyl groups with at least 80% of said hydroxyl groups being secondary hydroxyl groups.