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PARTLY-ETHERED MELAMINE FORMALDEHYDE RESINS, METHOD FOR THEIR PRODUCTION AND THE PRESSING MEASURES MADE FROM THESE MELAMINE RESINS.
PARTLY-ETHERED MELAMINE FORMALDEHYDE RESINS, METHOD FOR THEIR PRODUCTION AND THE PRESSING MEASURES MADE FROM THESE MELAMINE RESINS.
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机译:部分合成的三聚氰胺甲醛树脂,其生产方法和由这些三聚氰胺树脂制成的加压措施。
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摘要
Partially etherified melamine-formaldehyde resins having a melamine: formaldehyde molar ratio of 1:(1.25 to 1) can be prepared by a condensation reaction under neutral or weakly alkaline conditions if the condensation reaction is carried out in the presence of a glycol monoether of the general formula I R (OCH2 CH2)n OH (I) wherein R denotes alkyl having 1 to 4 C atoms and n denotes a number from 1 to 5. The partially etherified melamine-formaldehyde resins are suitable for the production of compression moulding compositions having a high flow and minimal processing shrinkage and after-shrinkage.
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