• Macromolecular Research
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• 제16권2호
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• pp.128-133
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• 2008

Several dual-curable acrylic pressure-sensitive adhesives (PSA) were synthesized by the radical polymerization of acrylic monomers containing benzophenone, hydroxyl, and alkyl groups. The optimum extent of UV-induced cure was determined by varying the content of the benzophenone groups (the photoinitiator) from 0.5 to 1.5 wt%. The weight average molecular weight of the polymers obtained ranged from 300,000 to 700,000 amu. The coated pressure-sensitive adhesives were cured either by short UV exposure to induce the grafting of acrylic polymers, or by heating for 6 hat $60^{\circ}C$ to promote the reactions between the polyisocyanates and hydroxyl groups. The dual-curing behavior was determined by monitoring both processes quantitatively by infrared spectroscopy. The developed dual-curable acrylic pressure-sensitive adhesives were found to compensate for the limitations in UV-induced curing of thick coatings.

• Journal of Pharmaceutical Investigation
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• 제35권3호
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• pp.173-177
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• 2005

Addition of 30% propylene glycol was required to maintain sink condition in the evaluation of percutaneous absorption of estradiol and norethindrone acetate. The permeability of estradiol was higher in silicone and SIS adhesives. However, estradiol was crystallized in silicone, SIS, and SBS adhesive matrix. The permeability ratio of estradiol or norethindrone acetate from acrylic pressure sensitive adhesives varied widely depending on the functional group of the acrylic adhesives. PEO grafting to acrylic adhesive seemed to change physicochemical property of acrylic adhesive and increased the permeability of estradiol and norethindrone acetate significantly. On the contrary, highly cross-linked enhancer compatible acrylic adhesive decreased the permeability of both estradiol and norethindrone acetate. $Span^{\circledR}$ 20 provided the highest enhancing effect on the permeability of both estradiol and norethindrone acetate followed by oleic acid and $Crovol^{\circledR}$ EP40. The permeability of the drugs from the developed system was comparable to that from commercial $Combitran^{\circledR}$, although significantly lower amount of estradiol and norethindrone acetate were loaded in the developed system.

• Elastomers and Composites
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• 제51권3호
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• pp.181-187
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• 2016

Transparent acrylic pressure sensitive adhesives (PSAs) were successfully prepared by photopolymerization with 2-ethylhexyl acrylate (2-EHA) and 2-hydroxyethyl acrylate (2-HEA) as a default constituent and with isobornyl acrylate (IBOA) and N-(isobutoxymethyl)acrylamide (IBMA) as a variable constituent. The IBMA mole fraction effect in the acrylic PSAs was investigated on adhesion performances and the optical properties including 85/85 test as well as the characteristics (solid content, and molecular weight) of the PSA syrups were also investigated. Regardless increasing the IBMA mole fraction in the acrylic PSAs, the acrylic PSAs exhibited almost the same adhesion performance such as $180^{\circ}$ peel strength (~4.0 kg/25 mm) and probe tack (~0.27 kg). All the acrylic PSA samples also showed high transmittance (more than 91%), low haze (less than 1.0%) and low color-difference (less than 1.0) before and after 85/85 test.

• 한국응용과학기술학회지
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• 제25권4호
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• pp.525-532
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• 2008

To prepare a solution type acrylic pressure-sensitive adhesive, quarter polymers were synthesized from butyl acrylate(BA), 2-ethylhexylacrylate(2-EHA) as a base monomer, methyl methacrylate(MMA) as a comonomer, each of methacrylic acid(MAA), acrylic acid(AA) as a functional monomer. Acrylic solution type pressure-sensitive adhesives(PSA's) of isocyanate derivative crosslinking PSA's were prepared by crosslinking of BEMM, BEMA with toluene-2,4-diisocyanate. The structure of adhesive was identified by FT-IR. The viscosity was measured by using Brookfield DV-III and molecular weight was measured by using gel permeation chromatography. The physical properties of polyethylene film coated with BEMMT, BEMAT were measured as a function of the concentration. As the result, BEMMT(0.6, 0.8), BEMAT(0.6) showed peel adhesion of $160{\sim}180\;g_f$/25 mm width and shear adhesion of more than 24 hours, and tackiness of $4/32{\sim}6/32$ which was relevant to commercial usage.

• 한국응용과학기술학회지
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• 제22권2호
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• pp.191-199
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• 2005

Removable protective adhesives for automobiles were synthesized by an emulsion polymerization of monomers such as n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN), acrylic acid (AA) and 2-hydroxyethyl methacrylate (2-HEMA), in which AA and 2-HEMA were functional monomers. Potassium persulfate (KPS) was used as an initiator and sodium lauryl sulfate (SLS) was used as an emulsifier, and polyvinyl alcohol (PVA) was used as a stabilizer. Emulsion polymerization was carried out in a semi-batch type reactor. Tensile strength, extension, peel strength, viscosity and solid content of the synthesized adhesives were tested. The optimum physical properties of the removable protective adhesives for automobiles were obtained with the composition of 0.43 mole BA, 0.57 mole AN, 0.21 mole BMA, 0.03 mole AA, and 0.03 mole 2-HEMA.

• 접착 및 계면
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• 제15권4호
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• pp.145-150
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• 2014

Dicyclopentadiene (DCPD)계 석유수지는 많은 분야에서 점착부여수지로 널리 사용되고 있다. 특히, 수소첨가 반응으로 수지 내 이중결합을 수소로 치환시킨 수첨(水添) DCPD계 석유수지는 무색투명의 색상과 빛과 열에 대한 우수한 안정성으로 인해, 고급 핫멜트접착제(hot melt adhesives, 이하 HMAs) 또는 열용융형 감압접착제(hot melt pressure sensitive adhesives, 이하 HMPSAs) 용도에 널리 사용되고 있다. 본 논문에서는 다양한 수첨 DCPD계 석유수지가 SIS와 SBS와 같은 SBCs를 기본 엘라스토머로 사용한 HMPSAs에서 점착부여수지로 사용될 때의 접착성능에 대해 논의하며, 점착부여 수지의 특성과 HMPSAs의 접착성능과의 상관관계를 보여준다. 높은 연화점의 점착부여수지를 사용할 수록 HMPSAs의 $T_g$, 연화점 그리고 crossover temperature가 높아졌다. 높은 방향족 모노머 함량의 점착부여수지를 사용할 경우에는, PSAs의 crossover temperature 및 연화점 감소로 확인할 수 있듯이 PSAs의 내열온도를 저하시키는 경향을 보였다.

• 접착 및 계면
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• 제14권2호
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• pp.95-100
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• 2013

본 연구에서는 메탈로센 폴리올레핀(metallocene polyolefin, me-PO)과 점착부여제(tackifier)를 이용해 열용융형 감압접착제(hot-melt pressure sensitive adhesives, HMPSAs)를 제조하여 물리적 특성을 확인하였고, me-PO가 HMPSAs의 용도에서 스타이렌계 블록 코폴리머(styrenic block copolymers, SBCs)를 대체하여 사용 가능한지에 대해 고찰하였다. 또한, me-PO를 베이스 폴리머로 사용한 HMPSAs의 성능을 최적화하기 위하여 점착부여제가 가져야 할 특성을 알아보고자 하였다. me-PO를 이용하여 Dahlquist Criterion을 만족하는 HMPSAs를 얻기 위해서는 점착부여제와 함께 10% 이상의 프로세스 오일을 혼합 사용하여야 했고, Spray Type의 Applicator에 적합한 수준의 점도를 가지는 HMPSAs를 얻기 위해서는 상대적으로 결정화도가 낮은 제2의 me-PO를 사용해야 했다. 그리고, 분자량이 큰 점착부여제를 사용하면 SBCs계 HMPSAs에 비해 부족한 유지력을 개선시키는데 기여하는 것으로 밝혀졌다.

• Elastomers and Composites
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• 제49권3호
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• pp.199-203
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• 2014

아크릴 단량체인 2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate (2-HEA), isobornyl acrylate (IBOA)를 광중합을 통하여 3원 공중합체 시럽을 합성하였다. 이관능기 아크릴 단량체인 1,6-hexanediol diacrylate (HDDA), poly(ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, 700)를 가교제로 사용하여 semi-IPN형 감압성 점착제 (Pressure sensitive adhesives; PSAs)를 UV-광가교 시켜 제조하였다. 가교제 변화에 따른 감압성 점착제의 점착특성, 저장탄성율, 그리고 광학특성을 고찰하였으며, 점착특성과 저장탄성율은 가교제의 화학구조와 분자량에 의존하였다. 광학특성은 모든 감압성 점착제에서 92.5 % 이상의 광투과도 (at 550 nm), 1.0 % 이하의 haze값, 0.3 이하의 색차계값을 보임을 확인하였다. 결과적으로 가교제의 종류에 영향을 받지 않음을 확인하였다.

• Journal of Pharmaceutical Investigation
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• 제38권4호
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• pp.223-228
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• 2008

The purpose of this study was to investigate the feasibility of developing transdermal drug delivery system (TDDS) for fentanyl used for the management of chronic cancer pain. The effect of type of pressure sensitive adhesive on the permeation of fentanyl from polyisobutylene (PIB), silicone and acrylic adhesive was evaluated. Due to the good adhesive force and relatively steady flux for 3 days, both acrylic and PIB adhesives were chosen for further study. The permeation rate of fentanyl was the highest from acrylic adhesive with hydroxyl functional group. Permeation rate increased linearly as the concentration of fentanyl in acrylic adhesive was increased from 2.5% to 10%. In case of PIB adhesive, crystals of fentanyl were developed above 5% drug load. $Crovol^{(R)}$ A40, $Crovol^{(R)}$ PK40 and Plurol $oleique^{(R)}$ provided higher flux of fentanyl.

• 한국응용과학기술학회지
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• 제17권4호
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• pp.262-266
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• 2000

Acrylic pressure sensitive adhesives of n-butyl acrylate, 2-ethyl acrylate, methyl acrylate, vinyl acetate, acrylic acid, acrylonitrile and 2-hydroxyethyl acrylate were synthesized and basic physical properties of pressure sensitive adhesives with increasing the contents of 2-hydroxyethyl acrylate were investigated. 2-Hydroxyethyl acrylates effects on glass transition temperature, viscosity, hardening time and peel strength. Glass transition temperature(Tg) decreased with increasing the contents of 2-hydroxyethyl acrylate. Viscosity and hardening time were increased with increasing the contents of 2-hydroxyethyl acrylate. On the other hands, peel strength increased with increasing the contents of 2-hydroxyethyl acrylate up to 6 wt% and the decreased at further higher contents of 2-hydroxyethyl acrylate. In peel test, interfacial failure was occured in 8 wt% and 10wt%.