Ligno-novolak resin molding compositions

Details Ligno-novolak resin molding compositions Ligno-novolak resin molding compositions

1980-10-16

1982-03-16

Nielsen, Earl A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

527403, 524594, C08G 828, C08H 502

Patent

active

043200362

ABSTRACT:
Ligno-novolak resins, either in the form of physical blends of lignin and novolak resins or as synthetically derived from the reaction of lignin, phenol and an aldehyde in the presence of an acidic catalyst, are provided. The resins, including the physical blends, are curable to thermoset, substantially completely cross-linked resins in which the lignin is interreacted and cross linked through the action of a curing agent such as hexamethylenetetramine. The resins are useful in the production of molding compounds that exhibit properties that are at least comparable to those of compounds derived from novolak resins. Moreover, excellent heat deflection temperatures and superior electrical properties are exhibited by such molding compounds.

REFERENCES:
patent: 2956033 (1960-10-01), Apel
patent: 3090700 (1963-05-01), Ball et al.
patent: 3185654 (1965-05-01), Ball et al.
patent: 3216839 (1965-11-01), Webster

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