DESMOPHEN® 670

Desmophen® 680 BA is a specific type of hydroxyl-bearing polyester resin designed primarily as a co-reactant for polyurethane coatings. Here’s a detailed overview based on the provided technical datasheet:

Product Overview:

• Trade Name: Desmophen® 680 BA
• Type: Hydroxyl-bearing polyester resin
• Application: Co-reactant for two-component polyurethane coatings

Characteristics:

• Chemical Structure: Branched hydroxyl-bearing polyester
• Compatibility: Suitable for use with Desmodur® N, Desmodur L/ultra L, and HL
• Solvent Compatibility: Thinnable with esters, ketones, and aromatic hydrocarbons (e.g., butyl acetate, acetone, toluene)
• Form Supplied: Approximately 70% in butyl acetate

Key Properties:

• Hazen Color Value: ≤ 200
• Acid Value: 16 ± 3 mg KOH/g
• Viscosity at 23°C: 3,000 ± 500 mPa∙s
• Non-volatile Content: 70 ± 1%
• Hydroxyl Content: 2.2 ± 0.5%
• Water Content: ≤ 0.1%
• Density at 20°C: Approx. 1.08 g/ml
• Flash Point: Approx. 32°C

Applications:

• Formulation: Used in two-component polyurethane coatings for various applications, including automotive and industrial coatings
• Performance: Provides coatings with good gloss retention, lightfastness, chalking resistance, and fast drying properties

Storage and Handling:

• Storage: Should be stored in tightly sealed containers away from moisture, heat, and foreign materials
• Shelf Life: Six months from the date of receipt, if stored as recommended

Basonol® HPE 1170 B is a hydroxyl-functional hyperbranched polyester designed for use as a co-binder in various coating systems. It is particularly suited for 2K (two-component) polyurethane (PUR) and 1K (one-component) clear and pigmented coating systems to enhance performance. This product is the updated version of the previous HPE-108.

Key Features and Benefits:

• Low Impact on VOC: Minimal contribution to volatile organic compounds (± 2% max), making it suitable for high solid coatings.
• Prolonged Pot Life: Extends the workable time of coatings.
• Improved Drying Speed: Enhances both physical and chemical drying times.
• Earlier Block Resistance: Reduces the tendency of freshly applied coatings to stick to themselves.
• Improved Hardness: Provides better early and final hardness.
• Reflow Behavior: Enhances the ability of the coating to reflow and smooth out, especially in clear coats.
• Chemical Resistance: Increases resistance to chemicals.
• Weathering Performance: Offers excellent durability and resistance to weathering.
• Low Hydrolysis Sensitivity: Less prone to degradation in the presence of water.

Applications:

• High Solid 2K PUR Systems: Enhances curing and application properties at low VOC.
  • High solid refinish clear coat
  • OEM clear coat
  • High solid and super high solid pigmented topcoats
  • Direct-to-metal (DTM) systems
  • Automotive, commercial, and industrial coatings
• 1K Stoving Systems: Provides improved hardness and chemical resistance, with excellent weathering performance.

Technical Specifications:

• Chemical Nature: Hyperbranched polyester
• Physical Form: Clear liquid resin
• Solids Content by Mass: 70 ± 2%
• Viscosity at 23°C: 4.4 ± 1.4 Pa.s
• Glass Transition Temperature (Tg): 18°C (64°F)
• Hydroxyl Value: 280 ± 10 mg KOH/g (solid resin)
• Acid Number: 85 mg KOH/g

Solubility:

• Good Solubility: Butanol, butyl acetate, methylethyl-ketone
• Limited Solubility: White spirit, Solvesso® 100
• Poor Solubility: Xylene, water

Storage:

• Shelf Life: One year if stored in tightly sealed original packaging at temperatures below 30°C (86°F).

Formulation Guidelines:

• Use as a co-binder (5-30%) on total polyol solids.
• Preferred use in combination with polyacrylates, but also compatible with polyesters, alkyds, and other resins.
• Compatibility should be verified before extensive testing.

Safety and Handling:

• Refer to the safety data sheet for handling guidelines and protective measures.