Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2000-03-31
2004-03-16
Zalukaeva, Tatyana (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S328500, C526S319000, C526S074000, C526S089000, C526S210000, C526S212000, C526S217000, C526S317100, C526S318300, C526S318400, C526S318420, C526S329200, C428S041500
Reexamination Certificate
active
06706836
ABSTRACT:
FIELD OF THE INVENTION
This invention is directed to the method of preparing hydrophilic poly 2-hydroxyethyl methacrylate polymers and copolymers and to their use as pressure sensitive adhesives, hydrogels, and coatings.
BACKGROUND OF THE INVENTION
The family of synthetic hydrogels includes polyacrylic acid, polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylamide, poly hydroxybutyl acrylate, and poly 2-hydroxyethyl methacrylate. In this family of synthetic hydrogels, poly 2-hydroxyethyl methacrylate and poly hydroxybutyl acrylate are water insoluble polymers prepared from a water soluble monomer. The other polymers require crosslinking to form a hydrogel with water.
2-Hydroxyethyl methacrylate polymers are of interest because of their biocompatibility as evidenced by excellent performance in animal implant studies. The extensive use of 2-hydroxyethyl methacrylate polymers for contact lenses for the eyes illustrates the non irritating nature of the polymers.
Other than commercial use in contact lenses, 2-hydroxyethyl methacrylate polymers have had limited commercial success, used at low percentages only, because of the nature of the monomer. Industrial grade 2-hydroxyethyl methacrylate monomer contains a small amount of crosslinker impurity which can cause gel formation during solvent polymerization. The 2-hydroxyethyl methacrylate monomer is water soluble and the 2-hydroxyethyl methacrylate polymer is water insoluble which causes difficulty in emulsion polymerization employing a high portion of 2-hydroxyethyl methacrylate monomer. The preparation of 2-hydroxyethyl methacrylate polymer therefore generally requires the use of very pure and expensive monomer or a very extensive and expensive polymerization process.
Requirements of high quality inkjet coatings include clarity, water resistance, good ink absorption with quick drying, and low surface friction to enhance sheet feeding in inkjet printers. Typical inkjet coatings satisfy the requirements of water resistance, good ink absorption with quick drying, and low surface friction through the use of mixtures of polymers, or polymers with pigments, however, these mixtures are not clear.
U.S. Pat. No. 2,976,576 describes the use of poly 2-hydroxyethyl methacrylate resin for contact lenses and body implants.
U.S. Pat. No. 3,220,960 describes the use of poly 2-hydroxyethyl methacrylate resin for contact lenses and body implants.
U.S. Pat. No. 3,567,760 describes the preparation of 2-hydroxyethyl methacrylate copolymers in methanol that are water soluble salts for entrapping drugs, pesticides, flavoring agents, and fragrances.
U.S. Pat. No. 3,963,685 describes the preparation of methanol soluble poly 2-hydroxyethyl methacrylate for wound care dressings using high purity 2-hydroxyethyl methacrylate monomer having not over 0.035 weight percent of alkylene glycol dimethacrylate impurities.
EP 024164A1 describes the preparation of methanol soluble poly 2-hydroxyethyl methacrylate using high purity 2-hydroxyethyl methacrylate monomer.
Polymer International, vol. 36 no. 4, pp.303-308 (April 1995), describes the preparation of dimethylformamide soluble poly 2-hydroxyethyl methacrylate using a chain transfer agent to prevent gellation.
U.S. Pat. No. 4,303,066 describes the use of a plasticized poly 2-hydroxyethyl methacrylate resin prepared from high purity monomer as a non-tacky synthetic film for skin burns, with shortened forming time by adding water to the mixture.
U.S. Pat. No. 4,593,053 describes the use of a plasticized polyvinyl pyrrolidone as a hydrophilic medical type pressure sensitive adhesive for biomedical electrodes and transdermal devices.
WO 92/11825 describes the use of plasticized poly 2-hydroxyethyl methacrylate resin as a hydrophilic medical type pressure sensitive adhesive for a medical device.
U.S. Pat. No. 5,225,473 describes the use of a UV cured plasticized polyvinyl pyrrolidone as a hydrophilic medical type pressure sensitive adhesive for biomedical electrodes and transdermal devices.
U.S. Pat. No. 4,892,787 describes coated paper for inkjet printing containing pigment, an acrylic emulsion, and a water soluble polymer.
U.S. Pat. No. 5,206,071 describes acrylic graft copolymers and water soluble polymers.
U.S. Pat. No. 5,478,631 describes an inkjet recording sheet using a pigment and an amphoteric ion latex.
EP 0716929A1 describes acrylic graft copolymers and water soluble polymers.
DE 19516111A1 describes water soluble copolymers with crosslinkers.
U.S. Pat. No. 5,672,392 describes the preparation of recording materials for inkjet printers using acrylic emulsions and water soluble polymers.
The present invention is directed to providing a cost-effective method for the preparation of hydrophilic 2-hydroxyethyl methacrylate polymers and copolymers with utility as coatings and pressure sensitive adhesives.
The present invention is further directed to providing clear inkjet coatings without pigments that are water resistant and have good ink absorption with quick drying.
SUMMARY OF THE INVENTION
A method is provided for the preparation of gel-free poly 2-hydroxyethyl methacrylate substantially in the absence of a chain transfer agent, comprising introducing monomeric 2-hydroxyethyl methacrylate containing ethylene glycol dimethacrylate impurities in the range of no more than about 0.05-0.1% by weight of the monomer, into alcohol, polymerizing the 2-hydroxyethyl methacrylate to form a polymerization mixture, and optionally removing the alcohol. The alcohol is preferably selected from one of methanol and ethanol. Hydrophilic pressure sensitive adhesives are provided by adding polyethylene glycol to the polymerization mixture prior to removing the alcohol. Flexible hydrophilic coatings also are provided by adding glycerin to the polymerization mixture prior to removing the alcohol by drying.
In another embodiment, the monomeric 2-hydroxyethyl methacrylate contains alkylene glycol methacrylate impurities in the range of no more than about 3% by weight, wherein the alkylene glycol methacrylate impurities are selected from the group consisting of ethylene glycol dimethacrylate, diethylene glycol monomethacrylate, methacrylic acid and mixtures thereof.
A method is also provided for the preparation of a gel free, hydrophilic, water soluble polymer substantially in the absence of a chain transfer agent comprising a copolymer of 2-hydroxyethyl methacrylate and acrylic acid or methacrylic acid, including introducing monomeric 2-hydroxyethyl methacrylate into water solution with one of acrylic acid and methacrylic acid, adjusting the pH of the solution to a pH in the range of greater than about pH 3 to less than about pH 9, and copolymerizing the monomeric 2-hydroxyethyl methacrylate and acrylic or methacrylic acid.
In one embodiment, the monomeric 2-hydroxyethyl methacrylate contains at least 0.05% by weight, based on the monomer, of ethylene glycol dimethacrylate.
In another embodiment, hydrogels are prepared with copolymer concentrations greater than about 35% by weight.
In another embodiment, the copolymer of 2-hydroxyethyl methacrylate and acrylic acid or methacrylic acid is blended with a polyalkylene glycol, such as polyethylene glycol, to form a pressure sensitive adhesive.
In another embodiment, the copolymer of 2-hydroxyethyl methacrylate and acrylic acid or methacrylic acid is blended with glycerin to form a flexible coating.
A method is also provided for the preparation of a gel free hydrophilic polymer substantially in the absence of a chain transfer agent comprising a copolymer of 2-hydroxyethyl methacrylate and 4-hydroxybutyl acrylate, including introducing monomeric 2-hydroxyethyl methacrylate containing no more than about 0.05-0.1% by weight of ethylene glycol dimethacrylate into an alcohol solution with 4-hydroxybutyl acrylate, polymerizing the 2-hydroxyethyl methacrylate and 4-hydroxybutyl acrylate to form a polymerization mixture, and removing the alcohol. The alcohol is selected from one of methanol and ethanol, with ethanol being preferred.
In another embodiment, the monomeric 2-hydroxyethyl methacrylate co
Barker H. Paul
Holguin Daniel L.
Lee Ivan S. P.
Lin Kenneth S.
Avery Dennison Corporation
Renner Kenner Greive Bobak Taylor & Weber
Zalukaeva Tatyana
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