| 摘要 |
The invention describes polyesters containing (meth)acrylate end groups, of the general formula (I) CH2=CRCOO-PE-OCOCR=CH2 where R=CH3 or H, where PE=[-A-OCO-B-COO-]m-A-, [-CHR'-COO-]n-A-[-OCOCHR'-]n, or combinations thereof, in which A is an alkylidene radical having 2-20 carbon atoms or an alkoxylidene radical having 2-1000, preferably 2-500, alkoxylidene units, B is a saturated alkylidene radical having 2-10 carbon atoms, R' is H or CH3, m is 1-100, n is 1-100, and, if both m and n are present, the sum m+n is 2-200, where the polyesters containing (meth)acrylate end groups are characterized in that a) the content of short-chain di(meth)acrylates (II) CH2=CRCOO-A-OCOCR=CH2 is <5% by weight, b) the content of hydroxyl groups is <0.25 mol/mol of (meth)acrylate, and c) the APHA color number is <200.
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