Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – Component of indefinite molecular weight greater than 150
Reexamination Certificate
1999-02-08
2001-04-17
Howard, Jacqueline V. (Department: 1764)
Chemistry of hydrocarbon compounds
Product blend, e.g., composition, etc., or blending process...
Component of indefinite molecular weight greater than 150
C428S3550BL, C428S492000, C524S483000, C524S484000, C525S099000
Reexamination Certificate
active
06218588
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the field of aromatic modified aliphatic hydrocarbon resins. More specifically, this invention relates to aromatic modified aliphatic hydrocarbon resins giving excellent balance between tack and shear properties even at low coating weights.
BACKGROUND
Aromatic modified aliphatic hydrocarbon resins have been used in solvent based tape formulations (U.S. Pat. No. 4,250,272, U.S. Pat. No. 5,177,163, WO 91/07472). However, the tape industry has begun lowering coating weights so that new and optimized systems are required to comply with this trend. Lower coating weights decrease the tack properties of the adhesive, and the hydrocarbon resins must therefore be modified to maintain the desired adhesion strength.
U.S. Pat. No. 3,846,352 (Goodyear) discloses the use of cyclic diolefins in combination with 2-methyl-2-butene in the polymerization feed for the production of aliphatic hydrocarbon resins. Further, alpha-methylstyrene was used for aromatic modifications. However, the resin properties were not related to the adhesive behavior, so that no optimization according to the requirements at lower coating weights were carried out.
U.S. Pat. No. 4,104,327 and U.S. Pat. No. 4,636,555 disclose the use of alpha-methylstyrene and para-methylstyrene in the aromatic part of the feed for the production of aromatic modified aliphatic hydrocarbon resins, respectively.
In view of the above, the present invention aims to provide novel aromatic modified aliphatic hydrocarbon resins with excellent tack and shear properties even at low coating weights. It is also an object of the invention to provide a method for the preparation of such aromatic modified aliphatic hydrocarbon resins. A further object of the invention is the use of the aromatic modified aliphatic hydrocarbon resins as mono-tackifiers in solvent based tape formulations. The invention further aims to provide an adhesive tape comprising the aromatic modified aliphatic hydrocarbon resin of the invention.
SUMMARY OF THE INVENTION
It was surprisingly found that the first object, which is the provision of an aromatic modified aliphatic hydrocarbon resin with excellent tack and shear properties even at low coating weights, can be attained by aromatic modified aliphatic hydrocarbon resins, comprising a resin having a Ring and Ball (R&B) softening point of 94° C. or lower, a weight-average molecular weight (Mw) of not more than 2000 Dalton, a Z-average molecular weight (Mz) of not more than 6000 Dalton and a mixed methylcyclohexane aniline cloud point (MMAP) between 25 and 450° C.
The aromatic modified aliphatic hydrocarbon resins showing the above parameters can be obtained by a method comprising the steps of obtaining polymerization feeds containing petroleum feeds comprising (a) C5 and C6 olefins and/or diolefins including cycloolefins, (b) aromatic monomers and (c) (di)cyclo-diolefins, subjecting the polymerization feeds to Friedel-Crafts-polymerization,and wherein
said C5 and C6 olefins and/or diolefins including cycloolefins and the aromatic monomers are used in an amount so that the resin has an MMAP between 25 and 45° C.;
and said (di-) cyclodiolefins are used in an amount so that the resin has an Mw of not more than 2000 Dalton and an Mz of not more than 6000.
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patent: 3846352 (1974-11-01), Bullard et al.
patent: 4959412 (1990-09-01), Arter et al.
patent: 5177163 (1993-01-01), Chu et al.
patent: 5502140 (1996-03-01), Daughenbaugh et al.
patent: 5714254 (1998-02-01), Jacob
patent: 5853874 (1998-12-01), Jacob
patent: 6106939 (2000-08-01), Donker et al.
patent: 0 794 202 A 1 (1997-10-01), None
patent: 0936229A1 (1999-08-01), None
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Dommisse Nicolaas Adriaan
Donker Christiaan Pieter Louis Charles
Theelen Michael Hendrikus
van Rijn Jacobus
Verrijzer Gerard Arie
Hercules Incorporated
Howard Jacqueline V.
Robert P O'Flynn O'Brien
Sloan Martin F.
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