Crosslinking method

Abstract

The invention provides a method of preparing a crosslinked polymer, which method comprises polymerising branched polyunsaturated monomers by a metathesis polymerisation reaction, wherein the branched polyunsaturated monomers contain acyclic ethylenically unsaturated groups that are capable of undergoing polymerization by a metathesis reaction such that the metathesis polymerisation produces a crosslinked polymer and substantially no non-volatile ethylenically unsaturated by-products.

1 - 21 . (canceled) 
     
     
         22 . A coating or adhesive product comprising:
 (1) branched polyunsaturated monomers that:
 (a) comprise at least a general structural unit (I):
   BR 1 R 2 R 3    (1)
 
 
   where B represents an atom or core, and where each moiety R 1 , R 2  and R 3 , which may be the same or different, contains at least one acyclic ethylenically unsaturated group which (i) is located within 6 atoms from the end of the moiety, and (ii) is capable of undergoing polymerization by a metathesis reaction contain terminal or near terminal acyclic ethylenically unsaturated groups that are capable of undergoing polymerisation by a metathesis reaction to form a crosslinked polymer to afford a crosslinked polymer and substantially no non-volatile ethylenically unsaturated by-products, and
 (b) are, or are derived from, a natural oil, and 
   (2) an olefin metathesis catalyst.   
     
     
         23 . The coating or adhesive product according to  claim 22  in the form of a two-part curable system, wherein the branched polyunsaturated monomers are provided in the first part and the olefin metathesis catalyst is provided in the second part. 
     
     
         24 . The coating or adhesive product according to  claim 23 , wherein the first part further comprises acyclic diene monomers. 
     
     
         25 . The coating or adhesive product according to  claim 23 , wherein the second part further comprises a polymer formed through acyclic diene metathesis polymerisation. 
     
     
         26 . The coating or adhesive product according to  claim 22 , wherein the olefin metathesis catalyst is selected from Grubbs catalyst first and second generation. 
     
     
         27 . A method of preparing near terminal ethylenically unsaturated carbonyl compounds, which method comprises subjecting a carbonyl compound comprising an acyclic ethylenically unsaturated group to a cross-metathesis reaction with substantially pure 2-butene. 
     
     
         28 . The method according to  claim 27 , wherein the carbonyl compound comprises one or more carbonyl functional groups selected from an ester, an amide, a ketone an aldehyde, a carboxylic acid and combinations thereof. 
     
     
         29 . The method according to  claim 27 , wherein the cross-metathesis reaction provides for a productive turn over number of greater than about 10,000. 
     
     
         30 . The method according to  claim 27 , wherein the carbonyl compound is a natural oil, a fatty acid derived from a natural oil, or a fatty acid ester derived from a natural oil.