Binding of fibrous material utilizing a crosslinked polyamic acid

a technology of crosslinked polyamic acid and fibrous materials, which is applied in the field of improved aqueous binding composition for use with fibrous materials, can solve the problems of unsuitable resins for fiberglass binders, inability to equate fiberglass binders with paper or wood products, and unwanted accumulation of fibers on the forming chamber walls

Inactive Publication Date: 2008-11-06
JOHNS MANVILLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fiberglass binders also cannot be equated with paper or wood product “binders” where the adhesive properties are tailored to the chemical nature of the cellulosic substrates.
Many such resins are not suitable for use as fiberglass binders.
Also, viscous binders tend to be tacky or sticky and hence they lead to the unwanted accumulation of fiber on the forming chamber walls.
This accumulated fiber may later fall onto the mat causing dense areas and product problems.
However, binder-coated fiberglass products are often of the commodity type, and thus cost becomes a driving factor, generally ruling out in some instances such resins as thermosetting polyurethane...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054]To a flask equipped with a reflux condenser were added 400 grams of water and 113 grams of a 30 percent solution of ammonia. To this solution were added 480 grams of poly(styrene-maleic)anhydride having a molecular weight of approximately 2,000 with stirring until partially dissolved. The solution was next heated to 90° C. and was maintained at that temperature for two hours to produce a clear solution of water-soluble polyamic acid having both amide and carboxylic acid groups.

example 2

[0055]To 100 grams of the polyamic acid solution of Example 1 were added with stirring 10.0 grams of diethanolamine serving as an organic crosslinking agent that was capable of undergoing a covalent crosslinking reaction with the polyamic acid. The resulting aqueous solution, having a viscosity somewhat greater than that of Example 2, next was coated on fiberglass by means of a curtain coater while in a bat configuration, and the coated fiberglass was heated at 180° C. for 2 minutes to expeditiously achieve the curing and crosslinking of the polyamic acid to form a white, rigid, and highly water-resistant cured binder in association with the fiberglass wherein adjoining fibers were bound at cross-over points. The cured binder was present on the fiberglass in a concentration of approximately 6 percent by weight based on the weight of the fiberglass. Comparable results were obtained at a curing temperature of 200° C. as well as when 7.0 grams of diethanolamine crosslinking agent were ...

example 3

[0056]Example 2 was repeated with the exception that 10.0 grams of triethanolamine crosslinking agent were substituted for the diethanolamine crosslinking agent. Comparable results were achieved at a curing temperatures of 180° C. and 200° C. and when 15.0 grams of triethanolamine crosslinking agent were utilized.

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Abstract

Improved binder technology for use with fibrous materials is provided whereby the adjoining fibers of a fibrous material are bound in the absence of a phenol-formaldehyde reaction product. A curable binder composition is provided which comprises a water-soluble polyamic acid and an organic crosslinking agent capable of undergoing a covalent crosslinking reaction with the polyamic acid. The polyamic acid is formed by the reaction of a polycarboxylic acid and/or polyanhydride having a molecular weight of at least 150 with ammonia and/or amine compound. The binding composition is coated on a fibrous material and is heated to achieve crosslinking of the polyamic acid to form a cured water-resistant binder in association with the fibrous material wherein adjoining fibers are bound at cross-over points.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The subject invention pertains to an improved aqueous binding composition for use with fibrous materials. More specifically, the subject invention pertains to the use of a curable binding composition comprising a water-soluble polyamic acid and an organic crosslinking capable of reaction with the polyamic acid. Such polyamic acid is formed by the reaction of a polycarboxylic acid and / or polyanhydride having a molecular weight of at least 150 and ammonia and / or an amine compound. The aqueous binding composition is coated on a fibrous material and is heated to achieve crosslinking to form a water-resistant cured binder in association with the fibrous material wherein adjoining fibers are bound at cross-over points.[0003]2. Description of the Related Art[0004]Binders for fibrous materials, such as fiberglass, have a variety of uses ranging from stiffening applications where the binder is applied to woven or non-woven fiber...

Claims

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Application Information

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IPC IPC(8): D06M13/224
CPCE04F15/10C07C215/08C08L2312/00C08F8/00Y10T428/2933C08F8/32C08F8/14C08K5/16D04H1/641C09J135/06C08F222/08C08L79/04D04H1/587D04H1/64
Inventor SHOOSHTARI, KIARASH ALAVIASRAR, JAWED
Owner JOHNS MANVILLE CORP
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