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1. WO2010074805 - PROCESS FOR THE PRODUCTION OF ACRYLIC AND METHACRYLIC ESTERS OF POLY(TRIMETHYLENE ETHER) GLYCOL

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CLAIMS What is claimed is:

1. A process for making a (meth)acrylic acid ester of a polytrimethylene ether glycol comprising:

a) polycondensation of hydroxyl groups-containing monomers predominantly comprising 1 ,3-propanediol obtained biochemically from a renewable source in the presence of acid catalyst at temperatures between 100 to 250 0C to form a poly(trimethylene ether) glycol

b) esterifying the obtained poly(trimethylene ether) glycol with an acrylic compound in the presence of a polymerization inhibitor(s) and optionally a solvent at temperatures between 25 to 250 0C.

2. A process for making a a(meth)acrylic acid ester of a polytrimethylene ether glycol comprising: reacting polytrimethylene ether) glycol having a number average molecular weight from 134 to 5000 with (meth)acrylic acid in the presence of an estehfication catalyst, a polymerization inhibitor and optionally a solvent at temperatures between 25 to 250 0C.

3. A process for making a (meth)acrylic acid ester of a polytrimethylene ether glycol comprising: reacting polytrimethylene ether) glycol with (meth)acrylic acid halide in the presence of an organic base or a catalyst at temperatures between 5 to 150 0C.

4. The process of Claim 1 , further comprising isolating polytrimethylene ether) glycol acrylate.

5. The process of claim 2 or 3, wherein the polytrimethylene ether) glycol is derived from a renewable source. 6. The process of Claim 1 , wherein the catalyst is sulfuric acid, aryl or alkyl sulfonic acid, triflic acid, and ion exchange resins

7. The process of claim 2, where in the esterfication catalyst is dialkyl tin dilaurate, titanium alkoxide, mineral acid and combination thereof.

8. The process of Claim 3, wherein organic base is thalkylamine or pyridine

9. The process of Claim 1 , wherein the polymerization inhibitor is selected from the group consisting of alkoxyphenol, alkyl phenols, alkoxyphenol, hydroxybezyl alcohol, and hydroquinones having a structure


wherein R1 , R2 and R3 are independently selected from the group consisting of: H, -CH3, -C2H5, -C3H7 -C4H9, -OCH3, -OC2H5, -OC3H7, OC4H9, -CH2OH.