Cured polymers dissolving compositions
US6818608B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 1, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A cured resin dissolving composition comprising an alkyl ammonium fluoride dissolved in a wide variety of solvents and co-solvents with a soluble amine and surfactant. The composition is ionized to release fluoride which penetrates and reacts with the cured resin causing bond cleavage, breakdown, and dissolution of polymeric structure. The solvent system may be composed of hydrophilic solvents such as amides, ketones, alcohols, esters, and ethers, as well as hydrophobic families such as alkanes, alkenes, halogenated hydrocarbons, and aromatic hydrocarbons of varying carbon chain length and molecular weight. The rate of reactivity of polymer breakdown is concentration dependent upon ionized fluoride, stimulated by solution polarity and upon the amine triggered release from the organo-fluoirde. This rate is determined to be optimum in hydrophilic solvent systems with an amine. The product may be used in manufacturing to remove unwanted cured resins and their residues. Using such a hydrophilic solvent system, the formulation can be easily rinsed with water, an alcohol, or another hydrophilic rinse. When used in a hydrophobic system, rinsing is achieved with a surfactanated pre-rinse, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.