Continuous two-stage preparation of solvent-free...

Details Continuous two-stage preparation of solvent-free... Continuous two-stage preparation of solvent-free...

2005-04-19

2005-04-19

Egwim, Kelechi C. (Department: 1713)

Coating processes

Coating remains adhesive or is intended to be made adhesive

Pressure sensitive adhesive

C524S556000, C524S560000, C525S055000, C526S931000, C526S935000

Reexamination Certificate

active

06881442

ABSTRACT:
In a continuous two-stage process for preparing solvent-free polyacrylate hotmelt pressure sensitive adhesives which is gentle on the polymer and redeploys the solvent used in the process the following steps are carried out:polymerizing a self-adhesive pressure sensitive adhesive in solution, the solvent having a low vapor pressure;continuously mixing the polymer solution with antioxidants and preheating the mixture under superatmospheric pressure without boiling it;concentrating the polymer solution to a residual solvent content of less than 0.1% by weight in a concentrating extruder under the effect of reduced pressure and elevated temperatures;condensing, collecting, and re-using the solvent stripped off in the extruder;compounding the abovementioned solvent-freed hotmelt pressure sensitive adhesive with tackifying resins, fillers, stabilizers, crosslinkers or other additives in a second extruder at a moderate melt temperature;transferring the blended solvent-free self-adhesive pressure sensitive adhesive to a downstream coating unit.

REFERENCES:
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PCT/EP01/06770—WO 01/96413, 2001.

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