Rheology control for adhesives based on formaldehyde resins

Details Rheology control for adhesives based on formaldehyde resins Rheology control for adhesives based on formaldehyde resins

C - Chemistry, Metallurgy

09

J

C09J 161/06 (2006.01) C08L 97/02 (2006.01) C09J 161/24 (2006.01) C09J 161/28 (2006.01) C09J 161/34 (2006.01) C08L 41/00 (2006.01)

Patent

CA 2491502

Water soluble polymers are incorporated into cellulose adhesives comprising phenol formaldehyde and related formaldehyde resins to impart more resistance to sagging and to increase the open time of the adhesive. A preferred use of the modified adhesive is as an adhesive for assembling engineered wood products such as strand board, particle board, medium density fiberboard, plywood and engineered products such as I-beams. The water soluble polymers achieve the objectives of increased sag resistance and more open time by increasing the viscosity of the adhesive and slowing the loss of water to the cellulose products and the air during use of the adhesive.

L'invention concerne des polymères hydrosolubles qui sont incorporés dans des adhésifs cellulosiques comprenant des résines de phénol-formaldéhyde et formaldéhydes connexes pour conférer plus de résistance à l'affaissement et pour accroître le temps ouvert des adhésifs. On utilise de préférence l'adhésif modifié pour assembler des produits en bois de haute technologie, tels que panneaux de grandes particules orientées, panneaux de particules, panneaux de fibres de densité moyenne, contreplaqués et produits de haute technologie tels que poutres en I. Les polymères hydrosolubles permettent d'atteindre les objectifs de résistance accrue à l'affaissement et de temps ouvert plus grand par augmentation de la viscosité de l'adhésif et ralentissement de la perte d'eau des produits cellulosiques et de l'air lors de l'utilisation de l'adhésif.

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