Unbalanced multi-block SBS and method for the preparation...

Details Unbalanced multi-block SBS and method for the preparation... Unbalanced multi-block SBS and method for the preparation...

2006-02-14

2006-02-14

Teskin, Fred (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S271000

Reexamination Certificate

active

06998446

ABSTRACT:
The present invention relates to the unbalanced multi-block styrene-butadiene-styrene (SBS) and provides the copolymer represented by the following structure, mB1*S1−lB2−S2−sB3,wherein B is a butadiene block, S is a styrene block, l, m, s are the relative size among the blocks (i.e., large size, middle size, and small size, respectively), and * is the tapered block between mB1 block and S1 block (i.e., random copolymer of a kind). They have to satisfy the following related expressions.in-line-formulae description="In-line Formulae" end="lead"?0.01lB2≦mB1≦0.5lB2 and 0.01mB1≦sB3≦0.5mB1   a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5S1≦S2≦1.5S1   b)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?5%≦*%≦25%   c)in-line-formulae description="In-line Formulae" end="tail"?In the related expression, the value of B1 and S1 include tapered block for the sake of convenience, and * % is the random styrene content in all the styrene in SBS.The unbalanced multi-block SBS of this invention exhibits excellent processability in the preparation of hot-melt adhesives, reducing processing hours. It also exhibits good adhesive properties such as initial loop tack, 180° peel strength, and holding power, and it has a normal level of heat resistance.

REFERENCES:
patent: 3231635 (1966-01-01), Holden et al.
patent: 3265765 (1966-08-01), Holden et al.
patent: 4051199 (1977-09-01), Udipi et al.
patent: 4163764 (1979-08-01), Nash
patent: 4603155 (1986-07-01), Muramori et al.
patent: 4874821 (1989-10-01), Agostinis et al.

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