US PATENT SUBCLASS 156 / 307.1
.~.~ By curing of nonfully polymerized self-sustaining lamina

Current as of: June, 1999
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156 /   HD   ADHESIVE BONDING AND MISCELLANEOUS CHEMICAL MANUFACTURE

1  DF  METHODS {7}
60  DF  .~ Surface bonding and/or assembly therefor {93}
307.1.~.~ By curing of nonfully polymerized self-sustaining lamina {2}
307.3  DF  .~.~.~> With coating or impregnating a face to be adhered {2}
307.7  DF  .~.~.~> Including uncurable lamina; e.g., metal, paper, etc.

DEFINITION

Classification: 156/307.1

By curing of nonfully polymerized self-sustaining lamina:

(under subclass 60) Subject matter wherein at least one of the self-sustaining laminae to be bonded has not been completely polymerized, that is, it contains reactable functional groups, and the bonding process includes a chemical reaction in which such groups are reacted to form molecules of higher weight than the starting material. The reaction takes place within the lamina to be bonded or involves the uniting of the aforementioned functional groups with functional groups of another lamina to be bonded or of another substance which is between the laminae.

(1) Note. Exemplary of functional groups in a lamina are the olefinic double bonds of natural rubber, the free

hydroxyl groups remaining in a cellulose-partial acetate ester, hydrous oxide groups on the surface of a metal, etc..

(2) Note. The reaction may be one in which a monomeric material is polymerized or in which an intermediate polymer is cross-linked, chain-extended, etc..

(3) Note. When the word "curing" is used, it is assumed that cross-linking takes place.

(4) Note. A cross-linking reaction generally produces a so-called "thermoset" bond which is no longer susceptible to softening by heat.

(5) Note. This subclass is limited to those processes in which at least some polymerization takes place at the time of bonding; final curing (e.g., of a coating, etc..) before assembly is not covered by this subclass.

(6) Note. Curing of an adhesive only, between the laminae to be bonded, after assembly of the sandwich, without the involvement of functional groups in a lamina to be bonded, is not covered by this subclass. See subclasses 325+.