Stabilized poly(.beta.-methyl- -valerolactone)

Details Stabilized poly(.beta.-methyl- -valerolactone) Stabilized poly(.beta.-methyl- -valerolactone)

C - Chemistry, Metallurgy

07

C

402/315, 260/488

C07C 69/67 (2006.01) C08G 63/08 (2006.01) C08K 5/29 (2006.01)

Patent

CA 1315289

- 1 - Abstract: The present invention is directed to polyester polyols containing the following recurring unit derived from .beta.-methyl- .delta.-valerolactone ? OCH2CH2CH(CH3)CH2CO ? in which the stability thereof has been improved by reducing the acid value to 0.25 or lower. This can be effected by heat treatment under reduced pressure to remove low-boiling compounds and/or by addition of an organic carbodiimide.

561256

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