ФЕНОКСИСМОЛА

Description

Phenoxy resin is a thermoplastic polyhydroxyether, a polycondensation product of bisphenol A with epichlorohydrin. It differs from epoxy resins of the same chemical series in its high molecular weight and the absence of terminal epoxy groups: the macromolecule is already formed and does not require curing, so the material is processed as a thermoplastic. Hydroxyl groups are regularly located in the chain - on average 40 or more per molecule - they provide adhesion to substrates and serve as crosslinking points when modified with isocyanates or melamine resins.

Basic Attributes

• CAS No: 26402-79-9
• Card formula: C54H60O9X2
• Molecular weight according to card: 853.05
• HS code: 39072099
• Appearance: granules
• Density: 1.18 g/ml at 25 °C (literature data)

Brands by molecular weight

Industrial brands differ in their weight-average molecular weight. The synonyms of the card indicate options with an average Mw of about 30,000, 60,000 and 70,000 (the latter according to GPC data), including in the form of granules. According to the literature, the typical range of Mw of phenoxy resins is from approximately 25,000 to values above 60,000, and individual high-molecular fractions exceed 250,000. For the most common grade of PKHH, a Mw of about 52,000 is given with an Mn of about 13,000 and a Brookfield viscosity of 180–280 cP for 20% solution in cyclohexanone at 25 °C.

Properties

• mechanical strength, rigidity, impact strength
• wear resistance and dimensional stability
• chemical resistance
• high adhesion due to hydroxyl groups in the chain
• flexibility of films and coatings

Scope of application

• adhesives, including for low-temperature bonding of wafers in microelectronics (below 300 °C) followed by laser separation
• protective and anti-corrosion coatings, primers, marine paints
• printing inks
• modifier for epoxy and other polymer systems
• structural and engineering plastics, automotive dashboards
• plastic printing forms
• binders for composite materials

Safety Information

• WGK Germany: 3
• Hazard class code: 45-20/21/22-36/38-43
• Safety instructions: 53-26-36/37-45
• Tags: T - toxic

Storage and handling

Store the granules in a closed container in a dry place, protected from moisture before processing. Code 43 in the classification indicates the possibility of sensitization upon contact with skin, therefore work with gloves; Instruction 53 advises to avoid exposure and obtain special instructions before use. The product is soluble in ketones and glycol ethers, which are used in the preparation of varnish solutions; Cyclohexanone is used in the standard procedure for determining viscosity.