| abstract |
The invention describes polyesters with (meth) acrylate end groups of the general formula (I) CH 2 = CRCOO-PE-OCOCR = CH 2 with R = CH 3 or H, with PE = [-A-OCO-B-COO-] m - A-, [-CHR'-COO-] n -A - [- OCOCHR'-] n , where A is an alkylidene group with 2-20 carbon atoms or alkoxylidene group with 2-1000 alkoxylidene units, B for a saturated alkylidene group with 2 -10 carbon atoms, R 'is H or CH 3 , m is 0-100, n is 0-100, with the proviso that the sum m + n is 2-200, the polyesters having (meth) acrylate end groups being characterized thereby are that a) the content of short-chain di (meth) acrylates (II) CH 2 = CRCOO-A-OCOCR = CH 2 <5% by weight, b) the content of hydroxyl groups <0.25 mol / mol (meth ) is acrylate and c) the color number according to APHA is <200. |