Tie-Coat

Water-borne adhesives are preferred because of restrictions on the use of solvents. Low viscosity prepolymers are emulsified in water, followed by chain extension with water-soluble glycols or diamines. As cross-linker PMDI can be used, which has a shelf life of 5 to 6 h in water. Water-borne polyurethane coatings are used for vacuum forming of PVC sheeting to ABS shells in automotive interior door panels, for the lamination of ABS/PVC film to treated polypropylene foam for use in automotive instmment panels, as metal primers for steering wheels, in flexible packaging lamination, as shoe sole adhesive, and as tie coats for polyurethane-coated fabrics. PMDI is also used as a binder for reconstituted wood products and as a foundry core binder. 

Solutions of the two recipes were blended in varying proportions to provide tie coats of continuously varying composition. The patent shows an example of eight plies or layers of graded composition between the rubber and the metal substrate. Because of the high fraction of reactive filler, the material closest to the metal substrate would be the most rigid and polar. The stiffness and polarity... 

One-component waterborne urethanes are used as packaging adhesives and tie coats and for automotive bonding of PVC. 

Modern bonding systems usually consist of a primer coat, often with a secondary tie coat, plus a tacky solution to assist in the application of the rubber. The bonding systems currently in use are usually suitable both for autoclave vulcanisation and vulcanisation at 100°C with atmospheric pressure steam or hot water. Ambient vulcanisation bonding systems have to be chemically active at the lower temperatures and are therefore specialist in nature. 

Chlorinated polyolefins (CPOs) also are a mainstay of adhesion promotion to TPO. The CPO generally is applied as a dilute solution (5-35 wt. %) in aromatic solvents to the TPO to act as a tie-coat, to which the topcoat is applied. These materials are often humidity sensitive and only adhere to TPOs with EPDM levels of greater than 5 percent. 

The laminate sheet is a flexible decorative sheet for use in surfacing an automobile body panel. The laminate revealed in this invention contains several layers, including clearcoat, tie coat, color coat, and adhesive layer. Clearcoat is formulated from polyvinylidene fluoride (to assure excellent weather resistance), tie coat is formulated from acrylic (good adhesion to both clear coat and color coat and weather resistance), color coat was formulated from PVC (see formulation in the above table) and adhesive was pressure sensitive acrylic formulation. 

In the materials science area, dendrimers have been used for adhesive tie coats to glass, metal, carbon, or polymer surfaces, additives for polymer resins and composites, printing inks, surfactants, cross-linking agents, electrically conductive nano devices,flow regulators, processing aids, and chemical... 

Conventional polyester gelcoats are sometimes used on epoxy laminates but care needs to be taken to ensure that a sufficient permanent bond between them has been obtained. Tie-coats are available for this purpose. 

Uses S/B for general-purpose coatings, paper saturation, tie coats for tape, mg backing... 

Uses Corrosion inhibitor, pigment for water systems and solv.-type primers tie coat pigment offering adhesion to dilficult-to-wet metals esp. aluminum... 

Uses Intermediate for mfg. of polymers modifying comonomer in prep, of vinyl acetate- and acrylic-based polymer latexes and sol n. polymers for mfg. of low VOC interior and exterior emulsion paints and decorative plasters, crack-bridging systems, textiles, leather coatings, tie coats for polyolefins, adhesives... 

Coatings may consist of one to three layers, depending on cost and quality. High quality coatings have a base or tie coat, an intermediate or filler coat, and finally a top coat. The base coat ensures adequate adhesion to the textile material. The intermediate coat is responsible for the system volume and the mechanical properties. The top coat determines the appearance and surface properties and also seals the surface. 

Pigmented polyurethane coatings No effect on colors. In solutions with coales-cents, produces good films for transfer coating fabric laminates employing urethane-be adhesive tie coats. 

Adhesives in relation to coated fabrics can be thought of as either the tie-coat to bond the surface coating to the fabric, or the surface coating itself, directly bonded to the fabric. The types of polymers used in coating fabrics are rubbers, PVC, polyurethane, acrylics and silicones the coatings are usually cross-linked to increase durability but some topcoats can be thermoplastic, for example polyurethanes, to facilitate thermal bonding of seams in production of garments or other articles. 

Block coat See tie coat, transition primer, and barrier coat. 

Tie coat n. Intermediate coat used to bond different types of paint coats. Syn block coat, transition primer, and barrier coat. 

Transition primer n. Coating compatible with primer and also with a finish coat, which is not compatible with the primer. See block coat, tie coat and barrier coat. 

Function in Formula Carrier for active, tie coat, solubilizer Solubility Characteristics Water-soluble... 

Chlorinated rubber is used in topcoats for heavy duty maintenance paints because of its low water permeability. It is also used in tie coats on polyolefin plastics. Chlorinated rubber dehydrochlorinates and requires stabilizers similar to those used with PVC. Some metal salts, especially those of iron, tend to promote degradation of chlorinated rubber and so it degrades when applied over rusty steel. Chlorinated ethylene/vinyl acetate copolymers have been developed that can be used to replace chlorinated rubber in at least some applications (183). 

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