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Toughened Epoxy Composition for Laminate Fabrication

IP.com Disclosure Number: IPCOM000052752D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Schiller, JM: AUTHOR

Abstract

Epoxy compositions can be toughened by the addition of a low molecular weight (3000-10,000) carboxyl terminated butadiene acryloninatrile copolymer (CTBN) (*j. A good way to introduce the CTBN is to pre-react it with an epoxy to form an adduct. This is then mixed with another epoxy and diluted prior to the addition of hardener and catalyst. On cure, the CTBN micro disperses to form a uniform two-phase dispersed second phase within the epoxy. If used to impregnate a glass fabric, the resulting nitrile-epoxy-glass structure will be significantly resistant to fracture, possess increased impact resistance and toughness, and adhere better with less internal stress.

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Toughened Epoxy Composition for Laminate Fabrication

Epoxy compositions can be toughened by the addition of a low molecular weight (3000-10,000) carboxyl terminated butadiene acryloninatrile copolymer (CTBN) (*j. A good way to introduce the CTBN is to pre-react it with an epoxy to form an adduct. This is then mixed with another epoxy and diluted prior to the addition of hardener and catalyst. On cure, the CTBN micro disperses to form a uniform two-phase dispersed second phase within the epoxy. If used to impregnate a glass fabric, the resulting nitrile-epoxy-glass structure will be significantly resistant to fracture, possess increased impact resistance and toughness, and adhere better with less internal stress.

For example, CTBN may be pre-reacted with a high functionality epoxy to form an adduct. To this composition is added dissolved dicyandiamide or an equivalent hardener and a catalyst such as tetramethyl butane diamine (TMBDA). The resulting composition is relatively stable at room temperature and can be used for glass fabric impregnation. The pre-reacted CTBN-epoxy adduct results in improved adhesion and dynamic-mechanical properties of the final composition. Reference [*] For example, see F. J. McGarry, ""Microcracking in Fibrous Glass Reinforced Resin Composites,'' Int. Conf. on Structure, Solid Mechanics and Engineering Design in Civil Engineering Materials, Southampton, England (April 1969).

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