Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1980-05-09
1981-10-27
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
525481, 528165, C08G 810
Patent
active
042974739
ABSTRACT:
Disclosed herein is a novel high-ortho phenolic novolac resin having excellent quick-curing property and thermal stability for use as phenolic resin molding material and perfectly free of divalent metal salt which is detrimental to the electrical properties of the molding material. This resin can be obtained by condensing a phenol and an aldehyde in an aldehyde/phenol molar ratio ranging from 0.6 to 1.0 and at a reaction temperature of more than 100.degree. C. at which the selectivity for condensation at the para-position is lowered (that is, the probability of the condensation at the ortho-position increases), with a weakly acidic catalyst having a specified dissociation constant (pKa value). The high-ortho phenolic novolac resin (having the specific molecular weight and ortho/para linkage ratio) obtained from said reaction is very useful for industrial applications as a phenolic injection molding material or epoxy/phenolic low-pressure encapsulation molding material with excellent electrical properties.
REFERENCES:
patent: 1737917 (1929-12-01), Cherry
patent: 2040207 (1938-05-01), Kraus
patent: 2167094 (1939-07-01), Turkington et al.
patent: 2330217 (1943-09-01), Hunn
patent: 2385372 (1945-09-01), Rhodes
patent: 2463501 (1949-03-01), Arvin
patent: 2475587 (1949-07-01), Bender
patent: 2934511 (1960-04-01), Auerbach et al.
patent: 3005797 (1961-10-01), Larkin et al.
patent: 3106547 (1963-10-01), McTaggart et al.
patent: 3133034 (1964-05-01), St. Clair et al.
patent: 3242118 (1966-03-01), St. Clair et al.
patent: 3308096 (1967-03-01), Ivanov et al.
patent: 3332911 (1967-07-01), Huck
patent: 3476707 (1969-11-01), Culbertson et al.
patent: 3538051 (1970-11-01), Higginbottom
patent: 3687896 (1972-08-01), Vargiu et al.
patent: 3870682 (1975-03-01), Endres et al.
patent: 3988386 (1976-10-01), Hesse et al.
patent: 4020048 (1977-04-01), Harrop
patent: 4097463 (1978-06-01), Culbertson
patent: 4113700 (1978-09-01), Culbertson
Koshibe Shigeru
Nanjo Motoyuki
Schain Howard E.
Sumitomo Bakelite Company Limited
LandOfFree
Quick-curing phenolic resin and process for preparing same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quick-curing phenolic resin and process for preparing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quick-curing phenolic resin and process for preparing same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-280236