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US 12,331,166 B2Granted
Composition containing a novolac
AssigneeBakelite AG
InventorStephan Schröter
Life of this patent
Estimating the term…
Abstract
The invention relates to a composition containing a novolak and water. In one embodiment, a composition is provided comprising novolak and water with the percentage of ortho linkages of the phenol rings of the novolak is greater than that of para linkages, the novolak having a phenolic compound and an aldehyde molar ratio of from 1:0.2 to 1:0.45 and the composition having from 2% to 20% by weight of water based on the weight of the sum of the novolak and the water.
Claims19
A homogenous novolak composition comprising:
- a novolak and
- 3.48 wt % to about 10 wt % water based on the total weight of the novolac and water, wherein:
- a percentage of ortho linkages of phenol rings of the novolak is greater than that of para linkages of the phenol rings of the novolak,
- the novolak has a phenolic compound to aldehyde molar ratio of from 1:0.25 to 1:0.4;
- and
- the composition has a viscosity of from 1,000 mPa*s to 5,000 mPa*s at 60° C., as determined by ISO 2884 1, and wherein the composition is a homogeneous liquid phase solution at a temperature of from 20° C. to 80° C.
3 more elements
A process for producing a composition comprising a novolak and water, comprising:
- a) producing a novolak comprising a percentage of the ortho linkages of the phenol rings is greater than that of the para linkages by condensation of a phenolic compound and an aldehyde in a ratio of from 1:0.25 to 1:0.4,
- b) mixing of the condensate produced under a) with from 3.48 wt % to about 10 wt % of water based on the total weight of the novolak and the water at temperatures in the range from 80 to 100° C. to produce a composition comprising the novolak and water, wherein the composition has a viscosity of from 1,000 mPa*s to 5,000 mPa*s at 60° C., as determined by ISO 2884 1, and the composition is a homogeneous liquid phase solution at a temperature of from 20° C. to 80° C.
A homogenous novolak composition comprising:
- a novolak having a molar ratio of phenolic compound to aldehyde of from 1:0.25 to 1:0.4, wherein a percentage of ortho linkages of the phenol rings is greater than that of para linkages;
- 1 to 10% by weight of a solvent selected from the group consisting of triethyl phosphate, tris(chloropropyl)phosphate, benzyl alcohol, dibasic esters, diethylene glycol and ethylene glycol and combinations thereof, based on total weight of the composition;
- and
- 3.48 wt % to about 10 wt % water based on the total weight of the novolac and water,
- wherein the composition does not contain a protective colloid, and
- wherein the composition has a viscosity of from 1,000 mPa*s to 5,000 mPa*s at 60° C., as determined by ISO 2884 1, and the composition is a homogeneous liquid phase solution at a temperature of from 20° C. to 80° C.
3 more elements
Dependencies are inferred from the claim text.