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Adhesive-for-rigid-PVC

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Adhesive for rigid PVC

Details

Inventors: Dierdorf, Hans-Rolf; Wegner, Juergen;
Assignee: Henkel Kommanditgesellschaft auf Aktien (Duesseldorf, DE)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Sarofim; N.
Attorney, Agent or Firm: Szoke; Ernest G., Millson, Jr.; Henry E., Greenfield; Mark A.

An adhesive composition and a method for its use in bonding rigid PVC elements. The adhesive composition comprises: (1) a first dissolved PVC polymer having a K-value of about 58 .+-. and a second dissolved PVC polymer having a K-value of about 45 to about 52; (2) at least one cyclic organic solvent; and (3) at least one non-cyclic organic solvent.

DETAILED DESCRIPTION We claim: 1.
An additive composition for bonding rigid PVC elements comprising: (1) about 10 to about 30% of (a) first dissolved PVC polymer having a K-value of about 58.
+-.
1; and (b) second dissolved PVC polymer having a K-value of about 45 to 52; (2) not more than 50% of at least one cyclic organic solvent for said polymers; and (3) the balance q.
s.
to 100% of at least one non-cyclic organic solvent for said polymers; all percentages being by weight and based upon the total weight of said adhesive composition.
2.
The composition of claim 1 wherein polymer (a) comprises about 40 to about 85% by weight of ingredient (1).
3.
The composition of claim 1 wherein polymer (a) comprises about 45 to about 60% by weight of ingredient (1).
4.
The composition of claim 1 wherein polymer (a) comprises about 40 to about 50% by weight of ingredient (1).
5.
The composition of claim 1 wherein polymer (a) comprises about 50% by weight of ingredient (1).
6.
The composition of claim 1 wherein polymer (b) has a K-value of about 49 to about 50.
7.
The composition of claim 2 wherein polymer (b) has a K-value of about 49 to about 50.
8.
The composition of claim 3 wherein polymer (b) has a K-value of about 49 to about 50.
9.
The composition of claim 5 wherein polymer (b) has a K-value of about 49 to about 50.
10.
The composition of claim 1 wherein ingredient (1) is present in about 20% by weight.
11.
The composition of claim 7 wherein ingredient (1) is present in about 20% by weight.
12.
The composition of claim 8 wherein ingredient (1) is present in about 20% by weight.
13.
The composition of claim 9 wherein ingredient (1) is present in about 20% by weight.
14.
The composition of claim 1 wherein said cyclic solvent (2) consists essentially of tetrahydrofuran and cyclohexanone, present in a total quantity of from about 30 to about 50% by weight.
15.
The composition of claim 11 wherein said cyclic solvent (2) consists essentially of tetrahydrofuran and cyclohexanone, present in a total quantity of from about 30 to about 50% by weight

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