Water-dispellable hot melt polyester adhesives
AssigneeMinnesota Mining and Manufacturing Company
InventorWayne K. Larson
Life of this patent
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Abstract
Water-dispellable, optionally pressure-sensitive hot melt resins having superior heat-aging properties are made by reacting (1) diols, of which at least 90% are polycaprolactonediol and/or monoalkylene diols, with (2) dicarboxylic acids, of which up to 95% are aliphatic, 5-25% are aromatic and have a magnesium or alkali metal sulfonate group attached to the ring, and the balance are non-sulfonated aromatic. These resins, which find use as hot melt adhesives for book binding and other purposes, can be readily dissolved or dispersed in a paper beater during a repulping operation. The product can be wound upon itself and supplied in roll form, optionally reinforced by a fibrous membrane.
Claims13
A water-dispellable strong hot melt adhesive, resistant to degradation upon continued exposure to high temperatures and functional at high humidities, consisting essentially of a polyester resin which is normally solid at 20.degree. C., has a ball-and-ring softening point greater than 35.degree. C., fuses at a temperature between 35.degree. C. and 200.degree. C., has an intrinsic viscosity in the range of 0.1 - 1.0 and contains substantially equimolar amounts of the residue of
- a. 100 mole percent dicarboxylic acid molecules consisting essentially of
- 1. 0-95 mole percent aliphatic dicarboxylic acid having at least two carbon atoms between carboxyl groups and having an average of 4-10 carbon atoms,
- 2. 0-95 mole percent aromatic dicarboxylic acid, no more than 85 mole percent being terephthalic acid, and
- 3. 5-25 mole percent aromatic dicarboxylic acid in which magnesium sulfonate or an alkali metal sulfonate is attached to an aromatic ring;
- and
- b. 100 mole percent diol molecules consisting essentially of
- 1. 0-100 mole percent of a monoalkylene glycol containing 2 to 10 carbon atoms,
- 2. 0-100 mole percent polycaprolactonediol, and
- 3. 0-10 mole percent polyoxyalkylene glycol, the sum of the mole percentages of monoalkylene glycol residues and polycaprolactonediol residues being at least 90.
Dependencies are inferred from the claim text.