Flexan 2

Example 49

Preparation of the Fragrance Emulsion.

Ninety-six grams of a fragrance, Greenfields (International Flavors and Fragrance, Union Beach, N.J.) was weighed out and combined with 24 g of NEOBEE oil (Stepan, Chicago, Ill.) and 14.4 g of isocyanate monomer, Desmodur® N100 (Bayer corporation, Pittsburgh, Pa., USA), to form the oil phase. In a separate beaker, an aqueous solution (115.2 g) containing 1.3% of FLEXAN II (Akzo Nobel, Bridgewater, N.J.) was mixed with a solution (30 g) of 1% CMC in Water to form the aqueous phase. The oil phase was then emulsified into the aqueous phase to form the fragrance emulsion under shearing (ULTRA TURRAX, T25 Basic, IKA WERKE) at 12500 rpm for two minutes.

Formation of Fragrance Capsules.

The fragrance emulsion was heated to 35° C. in a round bottom vessel before drop-wise addition of arginine monohydrochloride (20 g, 48%) and DABCO (0.4 g) under constant mixing with an overhead mixer. Formation of capsules was immediately visible by optical microscopy. The mixer speed was reduced after the addition of arginine monohydrochloride was complete. The temperature was raised 55° C. and then kept at 55° C. for 2 hours.

Example 23

Preparation of the Fragrance Emulsion.

Ninety-six grams of a fragrance, Greenfields (International Flavors and Fragrance, Union Beach, N.J.) was weighed out and combined with 24 g of Neobee oil M-5 (caprylic/capric triglyceride, Stepan, Chicago, Ill., USA) and 9.6 g of isocyanate monomer, and Takenate D110-N (trimethylol propane-adduct of xylylene diisocyanate, Mitsui Chemicals corporation, Rye Brook, N.Y., USA) to form the oil phase. In a separate beaker, a 1% surfactant solution (160 g) was prepared by dissolving sufficient amount of Flexan II (polystyrene sulfonate, Akzo Nobel, Bridgewater, N.J., USA) and CMC (carboxymethyl cellulose, WALOCEL CRT 50000 PA 07, Dow, Midland, Mich.) in water. The oil phase was then emulsified into the aqueous phase to form the fragrance emulsion under shearing (Ultra Turrax®, T25 Basic, and IKA® WERKE) at 6500 rpm for two minutes.

Formation of Fragrance Capsules.

The fragrance emulsion prepared in step 1 was heated to 35° C. in a round bottom vessel and to which 10.4 g of 49% branched polyethylenimine (Sigma-Aldrich, St. Louis, Mo.) was added under constant mixing with an overhead mixer. Formation of capsule was immediately visible by optical microscopy. The mixer speed was reduced after the addition of crosslinker was complete. The temperature was raised 75° C. and kept at 75° C. for 2 hours.

Example 50

Preparation of the Fragrance Emulsion.

Ninety-six grams of a fragrance, Greenfields (International Flavors and Fragrance, Union Beach, N.J.) was weighed out and combined with 24 g of NEOBEE oil (Stepan, Chicago, Ill.) and 19.2 g of isocyanate monomer, Desmodur® N100 (Bayer corporation, Pittsburgh, Pa., USA), to form the oil phase. In a separate beaker, an aqueous solution (115.2 g) containing 1.36% of FLEXAN II (Akzo Nobel, Bridgewater, N.J.) was mixed with a solution (30 g) of 1% CMC in Water to form the aqueous phase. The oil phase was then emulsified into the aqueous phase to form the fragrance emulsion under shearing (ULTRA TURRAX, T25 Basic, IKA WERKE) at 12500 rpm for two minutes.

Formation of Fragrance Capsules.

The fragrance emulsion was heated to 35° C. in a round bottom vessel before drop-wise addition of arginine monohydrochloride (19.8 g, 64%) and DABCO (0.6 g) under constant mixing with an overhead mixer. Formation of capsules was immediately visible by optical microscopy. The mixer speed was reduced after the addition of arginine monohydrochloride was complete. The temperature was raised 55° C. and then kept at 55° C. for 2 hours.