Binder comprising a crosslinked polyanhydride grafted with a...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S064000, C525S069000, C525S165000, C525S172000, C525S383000, C525S384000, C525S419000, C525S386000, C525S437000, C525S177000, C427S372200, C427S389800, C427S384000, C427S385500, C427S389700, C428S375000, C428S364000, C428S426000, C156S922000, C156S332000, C523S222000

Reexamination Certificate

active

07812097

ABSTRACT:
An improved curable formaldehyde-free binding composition is provided. Such curable composition comprises the reaction product of a polyanhydride and a polyol crosslinker and a lower molecular weight anhydride. Initially, the polyanhydride is modified through reaction with a polyol (e.g., a glycol or an alkanolamine) and subsequently is grafted with the lower molecular weight anhydride (e.g., maleic anhydride) to form a water-soluble or water-dispersible curable reaction product. The composition is well suited for binding fibrous materials (e.g., a mat of glass fibers) or for bonding together non-fibrous materials. The binder composition displays an advantageous viscosity so as to facilitate a flowable application with ease combined with an adequately high molecular weight to satisfactorily undergo service as a binder following curing even when harsh environmental conditions (e.g., hot humid air) are encountered for a prolonged period of time.

REFERENCES:
patent: 4278720 (1981-07-01), Shannon
patent: 5698641 (1997-12-01), Gould et al.
patent: 5763524 (1998-06-01), Arkens et al.
patent: 5837621 (1998-11-01), Kajander
patent: 6699945 (2004-03-01), Chen et al.

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