Compositions and methods for making polyesters and articles therefrom
View Patent ↗Polyester materials, methods for making polyesters materials, and uses of the polyester materials in binder materials and articles of manufacture are disclosed. In one embodiment, a process is provided for preparing a polyester solution, including mixing monomers of at least one organic acid containing at least three carboxylic groups and at least one multi-hydroxyl alcohol containing at least three hydroxyl groups to form a reaction mixture, heating the reaction mixture to a first temperature, polymerizing the monomers at the first temperature until reaching an acid value from about 200 to about 400 mg KOH/g, adjusting the temperature to a second temperature less than the first temperature, and forming the polyester solution. The polyester materials may be mixed with cross-linking materials to form binder materials. The binder material may then be used to form articles of manufacture.
1. A binder material prepared using a formulation comprising:
a polyester material formed from at least one organic acid having three carboxylic groups and at least one multi-hydroxyl alcohol having three hydroxyl groups;
a cross-linking agent comprising an acrylic polymer; and
a vinyl alcohol containing polymer, wherein the binder material is free of formaldehyde.
2. The binder material of claim 1 , wherein the formulation further comprises a formaldehyde-free aldehyde compound.
3. The binder material of claim 1 , wherein the vinyl alcohol containing polymer comprises from about 0.1 wt. % to about 20 wt. % of the formulation.
4. The binder material of claim 1 , wherein the acrylic polymer is selected from the group consisting of polyacrylic acid, polyacrylic ether polymer, polyacrylic ester polymer, polyacrylic amide polymer, and combinations thereof.
5. The binder material of claim 1 , wherein the acrylic polymer comprises from about 0.1 wt. % to about 50 wt. % of the formulation.
6. The binder material of claim 2 , wherein the formaldehyde-free aldehyde compound comprises from about 0.1 wt. % to about 10 wt. % of the formulation.
7. The binder material of claim 1 , wherein vinyl alcohol containing polymer comprises polyvinyl alcohol, a derivative thereof or a co-polymer thereof.
8. The binder material of claim 2 , wherein the formaldehyde-free aldehyde compound is selected from the group consisting of glyoxal, glutaraldehyde compound, and combinations thereof.
9. The binder material of claim 1 , wherein the polyester material is water-soluble.
10. The binder material of claim 1 , wherein the at least one organic acid having three carboxylic groups comprises citric acid.
11. The binder material of claim 1 , wherein the at least one multi-hydroxyl alcohol having three hydroxyl groups is selected from the group consisting of glycerol, trimethylolpropane, trimethyolethane, and combinations thereof.
12. The binder material of claim 1 , wherein the molar ratio of at least one organic acid to at least one multi-hydroxyl alcohol is from 1:3 to 3:1.
13. An article of manufacture comprising:
a substrate; and
a binder material, wherein:
the substrate comprises a fibrous material selected from the group consisting of glass fibers, mineral fibers (mineral wool), polyester fibers, cellulose materials, and combinations thereof;
the binder material functions to adhere the substrate together into or within the article of manufacture; and
the binder material is prepared using a formulation comprising:
a polyester material formed from at least one organic acid containing three carboxylic groups and at least one multi-hydroxyl alcohol containing three hydroxyl groups; and
a cross-linking agent comprising an acrylic polymer; and
a vinyl alcohol containing polymer, wherein the binder material is free of formaldehyde.
14. The article of claim 13 , wherein the binder material is prepared using a formulation further comprising a formaldehyde-free aldehyde compound.
15. The article of claim 13 , wherein the article of manufacture has a dry tensile strength from 40 lbf/1.5 inch to 100 lbf/1.5 inch.
16. The article of claim 13 , wherein the article of manufacture has a wet tensile strength from 3 lbf/1.5 inch to 70 lbf/1.5 inch.
17. The article of claim 13 , wherein the fibrous material comprise from about 70 wt. % to about 95 wt. % of the article of manufacture.
18. The binder material of claim 1 , wherein the polyester material is a self-crosslinkable polyester material.
19. The article of claim 13 , wherein the polyester material is a self-crosslinkable polyester material.
20. The article of claim 13 , wherein the vinyl alcohol containing polymer comprises from about 0.1 wt. % to about 20 wt. % of the formulation.
21. The article of claim 13 , wherein the vinyl alcohol containing polymer comprises polyvinyl alcohol, a derivative thereof or a co-polymer thereof.
22. The article of claim 14 , wherein the formaldehyde-free aldehyde compound comprises from about 0.1 wt. % to about 10 wt. % of the formulation.