Hitac Adhesives and Coatings RA-33W

Other characteristics

End Uses

Pressure Sensitive Adhesive

Functions

Release Agent

Compatible Polymers & Resins

Natural Rubbers (NR), Polyesters, Synthetic Rubbers, Vinyl Esters

Carrier

Water

Markets

• Adhesives & Sealants
• Printing & Packaging

Appearance

Clear to slightly hazy, Clear To Slightly Hazy

Technology

CASE Ingredients

HIGHLIGHTS

RA-33W is a second generation water based release agent used in a variety of pressure sensitive adhesive tapes including OPP packaging tapes and polyethylene-backed diaper fastening tapes with adhesives based on SIS block copolymers, SBR and natural rubber. The release is also effective in polyester, vinyl and filament tape constructions. Polypropylene and polyethylene films should be free of any lubricants, or other surface-finishing materials, and must be corona treated to 38 dyne/cm, or higher, to obtain effective release. Coater-ready solutions are easily prepared by mixing RA-33W with water (deionized if the local water supply is too hard) to 1-5% total solids, depending on the adhesive, substrate and coating method, which can be Meyer bar #6-12, rotogravure roll #160-250 and stacked smooth rolls. The following is a recommendation for initial laboratory evaluation: Coat the film placed on a glass plate with a 2% T.S. solution of RA-33W using a #6 Meyer rod and dry horizontally in air oven at 150ºF (70ºC) for 10 minutes or until completely dry. This may be followed by a pilot coater trial or production evaluation. Release properties develop by simply flashing off water in the production oven at 100-250ºF (40-120ºC), depending on web speed, oven length, dry air temperature, dry air velocity and other configurations. No crosslinking occurs on drying but it is important to achieve complete drying. Use the highest possible drying temperature to maximize the running speed. The coating is dry when the film is clear and resists moderate finger rub.

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Unwind Adhesion Value

UNWIND ADHESIONS (G/5CM) WITH GENERAL PURPOSE OPP PACKAGING TAPE WITH SIS-BASE BLOCK COPOLYMER PSA

Adhesive & Sealant Type

Pressure Sensitive Adhesive

Compatible Polymers and Resins

• Natural Rubbers (NR)
• Polyesters
• Synthetic Rubbers
• Vinyl Esters