Page 90 - Handbook of Adhesion Promoters

5.6 Leather 83

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Silane primer for orthodontic bonding
1 vol% 3-acryloxypropyltrimethoxysilane
0.5 vol% a crosslinking silane monomer (bis-1,2-(triethoxysilyl)ethane)
98.5 vol% 95/5% ethanol/water, with a pH of 4.5 (adjusted with 1 M acetic acid)
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Veneer-metal interface primer
0.5 wt% 6-(4-vinylbenzyl-n-propyl) amino-1,3,5-triazine-2,4-dithiol
99.5 wt% acetone
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Universal dental adhesion promoter composition
1 wt% 1-methacryloyloxydecane-10-phosphate
2 wt% 3-methacryloyloxypropyltrimethoxysilane
1 wt% lipoic acid 2-ethoxycarbonylallyl ester
96 wt% ethanol puriss
5.6 LEATHER

One-component polyurethane prepolymer base primer (a commercial one-component
primer (Inestrat-G, Insoco, Alicante, Spain); viscosity 0.16 Pas, solids content 36 wt%,
surface tension 28 mJ/m) was applied to avoid roughening of a bovine tanned leather, and
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to improve adhesion and mechanical properties. Polyurethane prepolymer reacted with
collagen fibers of the leather, creating urea moieties during curing.

5.7 METAL
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Primer for metal wire/thermoplastic (poly(ether)urethane (TPU) elastomer)
15 wt% polyols (hexa-functional dendritic polyester polyol (Boltorn H2004) and
trifunctional alkoxylated polyol (Polyol 3380))
10 wt% cationic reactive diluent (trimethylolpropane oxetane)
1 wt% silane (β-(3,4-epoxycyclohexyl)ethyl-tri-methoxysilane
(Silquest A-186))
2 wt% photo-initiator (iodonium salt (Irgacure 250))
0.5 wt% photosensitizer (isoprolthioxanthone)
71.5 wt% UV-curable monomer (3,4-epoxy cyclohexyl methyl-3,4 epoxy
cyclohexane carboxylate)

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Environmentally-acceptable primer for galvanized steel
Part A
9.2 wt% polyvinylbutyral
8.8 wt% aluminum phosphosilicate
1.3 wt% magnesium silicate
0.1 wt% carbon black
20.5 wt% n-butanol
57.7 wt% isopropanol
2.4 wt% water