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EP0458153A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Aqueous polyisocyanate dispersions and their use for the production of fiberglass mats

Assignee: Bayer Corp
•
Filing: 1991-05-11
•
Granted: —
•
Expires: 2011-05-11
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Abstract

Abstract The present invention is directed to an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared by a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and b) chain extending the dispersed polyisocyanate with a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.6:1.0 to 0.95:1.0. The present invention is also directed to a process for the preparation of a fibrous mat by treating fibers with the dispersed polyisocyanate before the isocyanate content of the dispersed polyisocyanate is less than 0.5% by weight, based on the weight of the polyisocyanate. Finally, the present invention is directed to the fibrous mats obtained in accordance with this process.

Inventors

  • 👤 Peter H. Markusch
  • 👤 Ashok M. Sarpeshkar

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 23:48
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/25; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/283; C08G18/70; C08G18/703; C08G18/705; C08G18/706; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8041; C08G18/8061; C08G18/8064; Y; Y10; Y10T; Y10T442/00; Y10T442/60

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 85 words
An aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared by a process which comprises a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and b) chain extending the dispersed polyisocyanate with a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.6:1.0 to 0.95:1.0.
Claim 2
Dependent Claim 28 words
The aqueous polyisocyanate dispersion according to claim 1, wherein said dispersed polyisocyanate is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.
Claim 3
Dependent Claim 38 words
An aqueous polyisocyanate dispersion according to claim 1 or 2, wherein said dispersed polyisocyanate has a functionality of at least 2 and an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate.
Claim 4
Dependent Claim 70 words
The aqueous polyisocyanate dispersion according to one of the claims 1 to 3, wherein said primary or secondary monoamine corresponds to the formula wherein R₁   represents hydrogen or an alkyl, cycloalkyl, araliphatic or aromatic group having up to 15 carbon atoms, R₂   is an optionally branched alkylene group containing 1 to 12 carbon atoms, m   represents 0 or 1, n   represents 1 or 2 and m + n   = 2.
Claim 5
Dependent Claim 34 words
The aqueous polyisocyanate dispersion according to claim 4 wherein R₁   is an alkyl group containing 1 to 6 carbon atoms and R₂   is an optionally branched alkylene group containing 1 to 4 carbon atoms.
Claim 6
Dependent Claim 54 words
A process for the preparation of a fibrous mat which comprises using the aqueous polyisocyanate dispersion according to one of the claims 1 to 5 and subsequently treating fibers with said dispersed polyisocyanate before the isocyanate content of said dispersed polyisocyanate is less than 0.5% by weight, based on the weight of the polyisocyanate.
Claim 7
Dependent Claim 11 words
The process according to claim 6 wherein said fibers comprise fiberglass.
Claim 8
Dependent Claim 33 words
The process according to claim 6 or 7 wherein said dispersed polyisocyanate is present in an amount of 1 to 20% by weight of polyisocyanate solids, based on the weight of the fibers.

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