What is polyHEMA?

What is polyHEMA?

polyHEMA, in full poly-2-hydroxyethyl methacrylate, a soft, flexible, water-absorbing plastic used to make soft contact lenses. It is a polymer of 2-hydroxyethyl methacrylate (HEMA), a clear liquid compound obtained by reacting methacrylic acid (CH2=C[CH3]CO2H) with ethylene oxide or propylene oxide.

What is hydroxyethyl methacrylate used for?

What is it? 2-hydroxyethyl methacrylate (HEMA) is an acrylic monomer. It is used in light curing polymer system and high performance coatings for lasting high gloss against scratching, solvents, and weathering.

Is methacrylate the same as HEMA?

2-Hydroxyethyl methacrylate (HEMA) is a methacrylate monomer used in polymer-based dental-restorative materials.

What is HEMA in chemistry?

Hydroxyethylmethacrylate or HEMA (also known as glycol methyacrylate, GMA) is the organic compound with the formula H2C=C(CH3)CO2CH2CH2OH. It is a colorless viscous liquid that readily polymerizes. HEMA is a monomer that is used to make various polymers.

What is Hioxifilcon A?

Hioxifilcon (A and D) is a copolymer of HEMA and glycerol methacrylate. It contains hydroxyl groups that tightly bind water and so it does not dehydrate as much as traditional HEMA materials do. The 59% hioxifilcon A material reportedly loses only 1 percent of its water content over a 12-hour period of lens wear.

What does pHEMA stand for?

PHEMA

What contains 2-hydroxyethyl methacrylate?

This substance is also used in high performance coatings for glass to guard against scratching and weathering. It is found in paint resins and binders for textiles and paper. It is also found in metal coatings as an adhesion promoter. How can you avoid contact with (2-hydroxyethyl)-methacrylate?

What is Etafilcon a made of?

Frequent replacement contact lenses made from the etafilcon A hydrogel lens material were introduced onto the market over 30 years ago, and etafilcon A remains the most widely used hydrogel lens material today.

What is HEMA monomer?

According to the British Association of Dermatologists (BOD), HEMA is the # 1 allergen product in nail products and cosmetics. Commonly known as 2-hydroxyethyl methacrylate or hydroxyethyl methacrylate, these are monomers which are used to polymerise UV gels.

How is hydroxyethyl methacrylate made?

HEMA, CAS# 868-77-9) is perhaps the most widely studied and used neutral hydrophilic monomer. This bifunctional monomer, which contains both acrylate and hydroxyl functionality, is produced from the esterification of methacrylic acid by ethylene glycol or from ethylene oxide via a ring-opening process.

What is the chemical formula for hydroxypropyl methacrylate?

Hydroxypropyl methacrylate (stabilised). CAS 27813-02-1, EC Number 248-666-3, chemical formula CH₂=C (CH₃)COOCH₂CH (OH)CH₃. More>> Hydroxypropyl methacrylate (stabilised). CAS 27813-02-1, EC Number 248-666-3, chemical formula CH₂=C (CH₃)COOCH₂CH (OH)CH₃. Less<

What is the boiling point and specific gravity of hydroxypropyl methacrylate?

Boiling point: 87 °C @ 0.67 kPa; Specific gravity: 1.028 @ 25 °C /2-Hydroxypropyl methacrylate/ Kirk-Othmer Encyclopedia of Chemical Technology. 4th ed. Volumes 1: New York, NY. John Wiley and Sons, 1991-Present., p. 16 (95) 475 Boiling point: 96 °C @ 1.3 kPa /2-Hydroxypropyl methacrylate/

How to prepare 2-hydroxypropyl methacrylate (HPMA)?

Copolymers of 2-Hydroxypropyl Methacrylate (HPMA) can be prepared with (meth)acrylic acid and its salts, amides, and esters, as well as with (meth)acrylates, acrylonitrile, maleic acid esters, vinyl acetate, vinyl chloride, vinylidene chloride, styrene, butadiene, and other monomers.

Can methacrylates be metabolized?

All Rights Reserved. SMALL QUANTITIES OF METHACRYLATES MAY READILY BE METABOLIZED BY SAPONIFICATION INTO THE ALCOHOL AND METHACRYLIC ACID. THE LATTER MAY FORM AN ACETYL-COENZYME A DERIVATIVE, WHICH THEN ENTERS THE NORMAL LIPID METABOLISM.