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Improved Oxidative Stability of Tetra Epoxy Amino Resins

IP.com Disclosure Number: IPCOM000062770D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Jones, CR: AUTHOR [+3]

Abstract

Tetrafunctional epoxy made from bis-p,p'-diaminodiphenylmethane, when made into an epoxy polymer has proven to have remarkably superior properties to epoxy polymers prepared from the bis- glycidyl ether of bis-phenol A (Figs. 1 and 2). This improvement in properties, in particular Tg (and related phenomena such as H2O uptake and dimensional stability), is due to the tetra-functionality which leads to greater crosslink density than the difunctional bis-phenol A-based resin. One drawback to this material is its oxidative instability at moderate temperatures (80ŒC). The site of this instability is the central methylene carbon atom (Fig. 3). After initial oxidation, formation of radicals and radical chain reactions leads to massive degradation.

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Improved Oxidative Stability of Tetra Epoxy Amino Resins

Tetrafunctional epoxy made from bis-p,p'-diaminodiphenylmethane, when made into an epoxy polymer has proven to have remarkably superior properties to epoxy polymers prepared from the bis- glycidyl ether of bis-phenol A (Figs. 1 and 2). This improvement in properties, in particular Tg (and related phenomena such as H2O uptake and dimensional stability), is due to the tetra-functionality which leads to greater crosslink density than the difunctional bis-phenol A-based resin. One drawback to this material is its oxidative instability at moderate temperatures (80OEC). The site of this instability is the central methylene carbon atom (Fig. 3). After initial oxidation, formation of radicals and radical chain reactions leads to massive degradation.

A variety of alternative tetrafunctional epoxy structures,

(Image Omitted)

which are prepared by similar methods from the bis-p,p'-diamino starting materials, but are unique improvements over the diphenylmethane structure in that the oxidation site is removed. Examples of such structures are seen in Fi

Disclosed anonymously.

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