Environmentally safe paint stripper

Details Environmentally safe paint stripper Environmentally safe paint stripper

2003-04-16

2004-09-14

Reddick, Judy M. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S557000, C134S038000

Reexamination Certificate

active

06790891

ABSTRACT:

FIELD OF INVENTION
Disclosed herein is an environmentally safe paint stripper composition and methods of making and using the paint stripper.
As used herein the term “DME” refers to mixtures of dimethyl esters of aliphatic dibasic organic acids, preferably C
4
-C
6
aliphatic dibasic acids, i.e., succinic acid, glutaric acid and adipic acid, respectively. A mixture of such esters is or can be a byproduct of the manufacture of adipic acid and is formed by esterifying a byproduct acid stream with methanol. Although such byproduct mixture of dimethyl esters varies, it is generally about 15 to 30 wt % succinate, about 50 to 73 wt % glutarate and about 6 to 25 wt % adipate. DMEs are available from Solutia Inc., St. Louis, Mo. and E.I. duPont de Nemours and Company, Wilmington, Del. The ratio of dimethyl ester components in a DME mixture can vary from 1-98 parts for each of the three components depending on availability of components. In the following examples, DME-1 is a mixture of about 17-25% dimethyl succinate, 59-73 wt % dimethyl glutarate and 10-14 wt % dimethyl adipate.
As used herein the term “PVB” refers to polyvinyl butyral resin, preferably as a dry, free-flowing powder. PVB resin is produced by known aqueous or solvent acetalization processes reacting polyvinyl alcohol (PVOH) with butyraldehyde in the presence of acid catalyst, followed by neutralization of the catalyst, separation, stabilization and drying of the reaction product polymeric resin. PVB useful in this invention can have a degree of acetalization of 0.1-99 mole % acetal, preferably 50-95 mole % acetal, more preferably 70-85 mole % acetal. PVB typically has about 15 to 22 wt % hydroxyl groups calculated as PVOH and up to 10 wt %, preferably 0 to 3 wt %, residual ester groups calculated as polyvinyl ester, e.g. acetate, the balance being acetal, preferably butyraldehyde acetal, but optionally including a minor amount of acetal groups other than butyral, for example 2-ethyl hexanal as disclosed in U.S. Pat. No. 5,137,954. PVB is available from Solutia Inc., St. Louis, Mo. and E.I. duPont de Nemours and Company, Wilmington, Del. In the following examples PVB-1 has a weight average molecular weight (Mw) in the range of 30,000 to 40,000 and about 17.5 wt % PVOH.
BACKGROUND OF INVENTION
European Patent publication EP376687 discloses a paint stripper made with water insoluble organic plasticizers, water soluble organic solvents and polyvinyl formal—a formaldehyde acetal made by reacting PVOH with formaldehyde.
Japanese Patent publication JP52018737 discloses a paint stripper comprising dichloromethane and polyvinyl formal.
German Patent publication DE3235899 discloses a correcting agent for dry removal of inks on a non-absorbing substrate comprising polyvinyl butyral and organic solvents.
Japanese Patent publication JP61223071 discloses a liquid ink eraser comprising polyvinyl butyral and organic solvents.
Solutia Inc.'s Product Bulletin 2149204B discloses Santosol DME solvents in organic-based and water-based formulations for paint strippers and cleaners.
SUMMARY OF THE INVENTION
The invention provides paint stripper compositions which can be environmentally safe, i.e. are readily biodegradable. Such paint stripper compositions comprise DME, PVB and water which can be mixed to provide an emulsion. Certain embodiments of the invention also comprise water soluble organic solvents, water-miscible organic solvents, surfactants, emulsifiers, thickeners and/or pigments. The invention further provides a method for removing paint from a substrate by applying the paint stripper compositions of the invention to the painted substrate, and removing the paint from the substrate.


REFERENCES:
patent: 2232806 (1941-02-01), Ryan
patent: 2437964 (1948-03-01), Marling
patent: 2749329 (1956-06-01), Ludlow
patent: 3329637 (1967-07-01), Vitalis
patent: 3841955 (1974-10-01), Coaker et al.
patent: 4946733 (1990-08-01), Seeger et al.
patent: 5030290 (1991-07-01), Davis
patent: 5137954 (1992-08-01), DasGupta et al.
patent: 6624222 (2003-09-01), Kestyn et al.
patent: 3235899 (1984-04-01), None
patent: 376687 (1990-07-01), None
patent: 52018737 (1977-02-01), None
patent: 61223071 (1986-10-01), None
SANTOSOL®, Dimethyl Esters Properties and Uses, Coating Performance Materials, Publication No. 2149204B, Solutia Inc., 1998.

Affiliated with

Also associated with

Rating

Environmentally safe paint stripper does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Environmentally safe paint stripper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Environmentally safe paint stripper will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3257153