Co- -2-methyl

The reported number of lanolin acids (C7 to C41) varies dramatically from 32 to 138.17 18 21,23-26 The possible explanation for this discrepancy is that different methods were used to produce the alcohols.8 The lanolin acids comprise four major classes normal, iso (co-l-methyl substituted), anteiso (co-2-methyl substituted), and a- and co-hydroxy acids. The relative proportions are 12.1% normal acids, 22.1% iso acids, 26.3% anteiso, 27.1% a-hydroxy acids, and 5.1% co-hydroxy acids.27 28 Minor constituents include polyhydroxy acids (4.7%) and unsaturated acids (2.1%).23-25... 

As previously noticed, butyl rubber (HR), poly(methylpropene-co-2-methyl-1,3-butadiene), is a random copolymer of isobutene and 0.7-2.2 mol% of isoprene. The industrial slurry process used all over the world consists in a low-temperature copolymerization initiated by A1C13 in meth-ylchloride. In contrast to 1,3-butadiene, isoprene copolymerizes readily with the more reactive isobutene. Reactivity ratios of the pair isobutene-isoprene, ri = 2.5 0.5 and r2 = 0.4 0.1, measured at the conditions of industrial process [10], show that the copolymerization behaves ideally (ri-r2 = 1), and, at the used low concentration of isoprene, isolated units of this latter comonomer are randomly distributed along the chain with 90% M-p-aiw-enchainment [52,53] ... 

Poly(nonylacrylate-co-2-methyl-5-vinyltetrazole) nonyl acrylate 2002MIK... 

Chart 9.5 Structure of poly[/V-(l-adamantyl)vi-nylsulfonamide-co-(2-methyl)adamantyl methacrylate], a random copolymer that absorbs light only weakly at 2=193 nm [33]. 

Poly(isobutylene co-isoprene) n. Poly(2-methyl-1 -propene-co-2-methyl-1,3-butadiene). 

Propylene Methanol Co2(CO)2 Methyl butyrate -f methyl isobutyrate 85 [523]... 

Poly(aciylic acid-co-2-methyl-5-vinylpyridine) water 1985VED... 

Poly(aciylonitrile-co-2-methyl- furan) N,N-dimethylformamide Asoi//b 1964USM... 

Poly(5-vinyltetrazole-co- 2-methyl-5-vinyltetrazole) N,N-dimethylfonnamide A,oi//b 298 K 1995KIZ... 

Poly(methyl metiiacrylate-co- 2-methyl-5vinylpyridine) (85/15, mol/mol, random) ... 

Butyl rubber is an elastomeric polymer used widely in adhesives and sealants, both as primary binders and as tackifiers and modifiers. Butyl rubber is poly(methylpropene-co-2-methyl-1,3-butadiene) or poly(isobutylene-co-isoprene). The latter is a copolymer of isobutylene with a small amount of isoprene [28]. These materials have relatively low strength and tend to exhibit creep under load. They are useful in packaging applications where their low permeability to gases, vapors, and moisture can be exploited. Butyl rubber is also used as an adhesive sealant. It is generally applied from a solvent-based solution [3,7]. Table 5.7 summarizes some of the important properties of butyl rubber adhesives. 

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