Compositions for producing foamed materials
The invention relates to a composition for the production of foams based on phenolic resin, use thereof, and a process for the production of the composition. For provision of a composition for the production of foams based on phenolic resin, where the said composition delivers improved reaction to fire with, in essence, no alteration of further important foam properties, it is proposed that the composition comprises an alkoxylated novolak, wherein the novolak is produced using phenol, cresol and/or xylenol.
1. A phenolic resin composition for the production of foams, the composition comprising:
at least one phenolic resole; and
at least one alkoxylated novolak, wherein the alkoxylated novolak is produced using phenol, cresol, xylenol, or combinations thereof, and wherein the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 3,000 g/mol.
2. The composition of claim 1 , wherein the degree of alkoxylation of the alkoxylated novolak is 30% to 100%.
3. The composition of claim 1 , wherein the alkoxylated novolak comprises an ethoxylated novolak, a propoxylated novolak, or both.
4. The composition of claim 1 , wherein the alkoxylated novolak comprises a binary mixture of ethoxylated novolak and propoxylated novolak.
5. The composition of claim 1 , wherein the alkoxylated novolak is a co-condensate obtained from a reaction of at least two different alkoxylating agents with at least one non-alkoxylated novolak.
6. The composition of claim 1 , wherein the alkoxylated novolak comprises a polyalkoxylated novolak.
7. The composition of claim 1 , wherein the alkoxylated novolak comprises from 5 wt % to 50 wt %, based on the weight of the phenolic resole.
8. The composition of claim 1 , further comprising one or more components selected from the group consisting of: additives, surfactants, emulsifiers, plastifying agents, solvents, hardeners, blowing agents, and combinations thereof.
9. A process for the production of the phenolic resin of claim 1 , comprising:
a) producing a phenol-formaldehyde condensate via condensation of at least one phenolic compound and formaldehyde in a molar ratio of from 1:1.0 to 1:3.0 with the aid of a basic catalyst,
b) distilling the phenol-formaldehyde condensate to remove water, and
c) adding an alkoxylated novolak to the distilled phenol-formaldehyde, wherein the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 3,000 g/mol.
10. The process of claim 9 wherein the alkoxylated novolak is used in a form dissolved in a solvent or solvent mixture.
11. The process of claim 9 , wherein the solvent or solvent mixture comprises triethyl phosphate, diethylene glycol, or both.
12. The process of claim 9 , wherein the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 2,000 g/mol.
13. The composition of claim 1 , wherein the phenolic resole has a weight average molecular weight (Mw) of 400 g/mol to 800 g/mol and the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 2,000 g/mol.
14. The process of claim 9 , wherein the phenol-formaldehyde condensate has a weight average molecular weight (Mw) of 400 g/mol to 800 g/mol and the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 2,000 g/mol.
15. The process of claim 9 , wherein the alkoxylated novolak is present in an amount from 5% to 50% by weight, based on the total weight of the alkoxylated novolac and the distilled phenol-formaldehyde, and wherein the alkoxylated novolak has a number average molecular weight (Mn) of 200 g/mol to 2,000 g/mol.
16. The process of claim 15 , wherein the alkoxylated novolak is an ethoxylated novolak, a propoxylated novolak, or both, and wherein the alkoxylated novolak has a degree of alkoxylation greater than 30%.