A number of paint removers and paint strippers

A number of paint removers and paint strippers have been introduced in recent years which avoid the use of methylene chloride and flammable, volatile and toxic chemicals such as benzene, toluene, phenol, acetone oil paintings, etc. N-methyl-2pyrrolidone (NMP) has been employed in place of methylene chloride as a solvent ingredient in paint-stripper compositions as suggested in several patents. U.S. Pat. No. 4,759,510, for example, describes a paint stripper having a low volatility which includes about 20% to 90% by weight of NMP and 30% to 70% by weight of an aromatic hydrocarbon solvent. U.S. Pat. No. 4,836,950 describes liquid formulations for removing screen printing inks which comprises a mixture of NMP and gamma-butyrolactone.

Recently, non-hazardous products for removing paint have been introduced which incorporate the use of benzyl alcohol as a principal solvent. The performance of benzyl alcohol-based strippers is improved when activated with hand-painted oil painting an acid, but such stripping agents may deleteriously affect high strength steel which is used, for example, in aircraft landing gear parts. Benzyl alcohol-based strippers also have been available which contain an alkaline component rather than an acid for activation. EP Patent Application 497,130 A2 describes paint-stripper formulations containing a solvent system comprising an ester of a benzyl or methyl benzyl alcohol. In particular, the formulations comprise benzyl alcohol/benzyl formate/formic acid, and such formulations are reported to strip polyurethane and epoxy paint systems more than 2.5 times as fast as equivalent benzyl acetate/benzyl alcohol/acetic acid formulations.

Paint strippers and paint removers are utilized abstract oil paintings in the aerospace industry for removing paints from commercial and military jet aircraft. Periodic paint removal is required for aesthetic reasons, for a change of colors, or more importantly, for inspection of the air frame as required for safe operation of an aircraft. Any of the alkyl-substituted benzyl alcohols may be utilized, and the alkyl groups generally contain from 1 to about 4 carbon atoms. Specific examples of the alkyl-substituted benzyl alcohols include: alpha-methylbenzyl alcohol, alpha-ethylbenzyl alcohol, ortho-methylbenzyl alcohol, meta-methylbenzyl alcohol, para-methylbenzyl alcohol, ortho-ethylbenzyl alcohol, para-ethylbenzyl alcohol, para-propylbenzyl alcohol, para-n-butylbenzyl alcohol and para-t-butylbenzyl alcohol.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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