초록 ▼

A process for the manufacture of non-cellular and cellular polyurethane elastomers by (a) preparing a hydroxyl group-containing prepolymer by reacting a higher molecular weight polyhydroxyl compound and optionally a chain extender with an organic diisocyanate at a weight ratio of OH groups to NCO gr

A process for the manufacture of non-cellular and cellular polyurethane elastomers by (a) preparing a hydroxyl group-containing prepolymer by reacting a higher molecular weight polyhydroxyl compound and optionally a chain extender with an organic diisocyanate at a weight ratio of OH groups to NCO groups of 1.2:1 to 2:1, (b) dividing the prepolymer into two components A and B in a weight ratio of about 80:20 to 20:80, (c) reacting component A with 1,5-naphthylene diisocyanate (NDI) in a weight ratio of OH:NCO groups of about 1:2.5 to 1:12 to produce a terminal NCO group-containing NDI-polyurethane adduct, (d) mixing component B with chain extenders and/or cross-linking agents and/or water, and optionally auxiliaries and additives, and (e) reacting the NDI-polyurethane adduct (from step c) with the mixture from step d.

대표청구항 ▼

A process for the manufacture of polyurethane elastomers comprising the steps of: (a) preparing a hydroxyl group-containing prepolymer by reacting a higher molecular weight polyhydroxyl compound with an organic diisocyanate at a weight ratio of OH groups to NCO groups of about 1.2:1 to 2:1, (b) div

A process for the manufacture of polyurethane elastomers comprising the steps of: (a) preparing a hydroxyl group-containing prepolymer by reacting a higher molecular weight polyhydroxyl compound with an organic diisocyanate at a weight ratio of OH groups to NCO groups of about 1.2:1 to 2:1, (b) dividing said prepolymer into two components A and B in a weight ratio of about 80:20 to 20:80, (c) reacting component A with 1,5-naphthylene diisocyanate (NDI) in a weight ratio of OH:NCO groups of about 1:2.5 to 1:12 to produce a terminal NCO group-containing NDI-polyurethane adduct, (d) mixing component B with material selected from the group consisting of chain extenders, crosslinking agents, water and mixtures thereof and optionally auxiliaries and additives, and (e) reacting said NDI polyurethane adduct (from step c) with the mixture from step d.