Abstract The invention provides a process for forming a laminate, which process comprises the steps of: A. REACTING A SYTRENE WITH A PHENOL IN THE PRESENCE OF AN IONIC CATALYST TO PREPARE A STYRENATED PHENOL, B. WATER WASHING THE STYRENATED PHENOL C. MIXING THE WASHED STYRENATED PHENOL WITH A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, CRESOL AND XYLENOL, AND AN ALDEHYDE, THE WEIGHT RATIO OF PHENOL TO STYRENATED PHENOL IN THE MIXTURE BEING 95:5 TO 30:70 D. CONDENSING THE MIXTURE IN THE PRESENCE OF A VOLATILE ALKALINE CONDENSATION CATALYST E. IMPREGNATING FIBROUS SHEETS WITH THE RESIN PRODUCT THUS OBTAINED, DRYING THE IMPREGNATED SHEETS, ASSEMBLING A PLURALITY OF THE DRIED SHEETS AND HEATING THE ASSEMBLED SHEETS UNDER PRESSURE TO FORM THE DESIRED LAMINATE. The laminates so produced have good electrical properties.
A process as claimed in claim 1 wherein the aldehyde is formalin, the proportion of formalin to the total combined weight of phenol and styrenated phenol being from 75:10 to 225:100 by weight.
Claim 2
Dependent Claim
24 words
A process as claimed in claim 1, wherein the proportion of the phenol to the styrenated phenol is from 80:20 to 20:40 by weight.
Claim 3
Dependent Claim
52 words
A process as claimed in claim 1 wherein the styrene is selected from the group consisting of styrene, Alpha -methyl styrene and vinyl toluene and is reacted with the phenol selected from the group consisting of phenol, cresol and xylenol in a weight ratio of styrene to phenol of 50:100 to 300:100.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 4, wherein the weight ratio of styrene to phenol is 100:100 to 160:100.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1, wherein the condensation product is recovered by heating the resin product under reduced pressure.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 6, wherein subsequent to heating the resin condensation product, an organic solvent is added thereto to form a varnish.
Claim 7
Dependent Claim
10 words
A laminate prepared in accordance with the process of claim