POLYMER, COMPOSITIONS AND PROCESS FOR PREPARING THEM

摘要

There is described a process for preparing an silane-functional oligomer (such as an alkoxysilane polyurethane) suitable for use as a crosslinkable coating component, the process comprising the steps of: 1) reacting an aminoalkyl silane with a cyclic carbonate, lactone or lactam to form a hydroxyl (OH) or imino (NH) functional silane intermediate, 2) reacting the silane intermediate from step 1) (optionally immediately without isolation) with a diisocyanate (diNCO) to form a silane functional polyurethane; where in step 2) the molar ratio of the total amount OH or NH groups on the silane intermediate of step 1) to the diisocyanate is from 1.8 to 2.2 (preferably about 2.0) and the resultant silane polymer is substantially-free of isocyanate groups thereon.

主权项

1. A process for preparing a silane polymer, the process comprising the steps of:
1) reacting
(i) a first component (=Silane Component I) comprising at least one silyl group(s) and at least one reactive group(s) A (Group A); with(ii) a second component (=Cyclic Component II) comprising at least one organo cyclic moeit(ies) and at least one reactive group(s) B (Group B) reactive with Group A,to form an intermediate product (=Silane Intermediate);where at least one of the Silane Component I and/or the Cyclic Component II comprise at least one active-reactive group(s) and/or precursors therefor (r-grp(s));where Group A and Group B are selected to react with each other under the conditions of step (1) to form the Silane Intermediate; andwhere the Silane Intermediate comprises at least one silyl group(s), at least one organo moeit(ies) derived from the at least one organo cyclic moeit(ies) from Cyclic Component II and at least one r-grp(s); and 2) reacting the Silane Intermediate from step (1) with at least one reagent (=Active-Component III), comprising a plurality of active-groups (=a-grps) to form a polymeric product (=a Silane Polymer) that is substantially free (calculated with respect to Active-Component III) of a-grps;
where in step (2), the total moles of the r-grp(s) on the Silane Intermediate are at least substantially the same as the total moles of a-grps comprising the Active-Component III.