Rubber-based adhesive composition and rubber-based adhesive tape for automobile using the same

1. A rubber-based layer prepared by hardening a rubber-based adhesive composition, wherein the rubber-based adhesive composition consists of:

a styrene-butadiene-styrene (SBS) rubber;

a hardener;

an adhesion enhancer;

an antifoaming agent, and

optionally further consisting of at least one selected from the group consisting of an ultra-violet (UV) stabilizer, a photoinitiator, a thermal initiator, an antioxidant, and a filler,

wherein the adhesion enhancer is a hydrogenated ring-type olefin-based resin,

wherein an amount of the adhesion enhancer ranges from 50 parts to 80 parts by weight based on 100 parts by weight of the SBS rubber,

wherein an amount of the SBS rubber ranges from 10 to 30 parts by weight based on 100 parts by weight of the rubber-adhesive composition,

wherein an amount of the adhesion enhancer ranges from 5 to 15 parts by weight based on 100 parts by weight of the rubber-adhesive composition,

wherein a styrene amount of the SBS rubber ranges from 20 wt % to 30 wt %, and wherein a hardening degree (Gel amount) in the rubber-based adhesive layer ranges from 30% to 50%.

2. The rubber-based adhesive layer of claim 1 , wherein the hardener is at least one selected from the group consisting of 1,6-hexanediol diacrylate, dipentaerythritol hexaacrylate, tetramethylolmethane tetraacrylate, tetramethylolmethane triacrylate, trimethylolpropane triacrylate, 1,6-bis(3-acryloyloxy-2-hydroxypropyloxy)hexane, polyethylene glycol diacrylate, pentaerythritol triacrylate, and a hexamethylene diisocyanate urethane prepolymer.

3. The rubber-based adhesive layer of claim 1 , wherein a softening point of the adhesion enhancer is 90° C. or higher.

4. A rubber-based adhesive tape for an automobile, the tape comprising

an acryl foam layer; and

a rubber-based adhesive layer claim 1 , wherein the rubber-based adhesive layer is formed on both surfaces of the acryl foam layer.