Composite sheet material and process of making
View Patent ↗A composite sheet material, useful as a component of roofing shingles, and a process of making same, which includes a glass fiber web bound with a thermosetting resin which includes a fatty acid amide having the structural formula RCOONH 2 , where R is a C 8 -C 25 alkyl.
1. A composite sheet roofing material comprising:
a resin binder laden glass fiber mat having incorporated therein:
(a) a dispersion comprising a fatty acid amide of the structural formula RCOONH 2 , where R is a C 8 -C 25 alkyl, and a dispersion agent, the dispersion agent being a cationic surfactant that is an ethoxylated fatty alkyl amine having a chain length of about C 8 to about C 18 ; and
(b) a carboxylated styrene-butadiene copolymer.
2. A composite sheet roofing material in accordance with claim 1 wherein R is a C 10 -C 22 alkyl.
3. A composite sheet roofing material in accordance with claim 1 wherein R is a C 17 -C 20 alkyl.
4. A composite sheet roofing material in accordance with claim 3 wherein said fatty acid amide is stearamide or tallowamide.
5. A composite sheet roofing material in accordance with claim 1 wherein said resin binder laden glass fiber mat comprises a resin binder selected from the group consisting of a urea formaldehyde resin, a phenol formaldehyde resin and a phenolic resin other than a phenol formaldehyde resin.
6. A composite sheet roofing material in accordance with claim 5 wherein said resin binder is urea formaldehyde.
7. A composite sheet roofing material in accordance with claim 1 wherein said fatty acid amide is present in a concentration in a range between about 0.25% and about 5.0%, said percentages being by weight, based on the total weight of resin binder.
8. A composite sheet roofing material in accordance with claim 7 wherein said fatty acid amide is present in a concentration of between about 0.35% and about 3%.
9. A composite sheet roofing material in accordance with claim 1 wherein said carboxylated styrene-butadiene copolymer is present in a concentration of about 1% to about 20%, said percentage being by weight, based on the total weight of the resin binder.
10. An asphalt roofing shingle comprising said composite sheet roofing material of claim 1 coated with a filled asphalt compound.
11. A composite sheet roofing material comprising a mat of glass fibers randomly bound in a binder of a urea formaldehyde resin, wherein the composite sheet material further includes a fatty acid amide dispersion comprising a fatty acid amide having the structural formula RCOONH 2 , where R is a C 17 -C 20 alkyl, and a dispersion agent, the dispersion agent being a cationic surfactant that is an ethoxylated fatty alkyl amine having a chain length of about C 8 to about C 18 ; and wherein the resin binder further comprises a carboxylated styrene-butadiene copolymer.
12. A cured composite sheet roofing material comprising a resin binder laden glass fiber mat, the resin binder laden glass fiber mat comprising glass fibers randomly bound in a binder of a urea formaldehyde resin, the resin binder laden glass fiber mat having incorporated therein a fatty acid amide dispersion comprising a fatty acid amide of the structural formula RCOONH 2 , where R is a C 8 -C 25 alkyl, and a dispersion agent, the dispersion agent being a cationic surfactant that is an ethoxylated fatty alkyl amine having a chain length of about C 8 to about C 18 ;
wherein the composite sheet roofing material is prepared by a process comprising the steps of:
(a) dispersing glass fibers in an aqueous dispersant;
(b) screening said glass fibers so that said dispersed glass fibers form a glass fiber mat;
(c) contacting said glass fiber mat with a resin binder which includes a fatty acid amide dispersion to form a resin binder laden glass fiber mat, said fatty acid amide in the fatty acid amide dispersion present in a concentration in the range of between about 0.25% and about 5% based on the total weight of said resin binder, wherein said fatty acid amide dispersion is either sprayed onto a resin laden glass fiber mat or mixed with the resin binder and the resultant mixture applied to the glass fiber mat; and
(d) curing said resin binder laden glass fiber mat by heating to a temperature in the range of between about 270° C. and 300° C. for a period of about 5 to about 20 seconds.